Form 10-Q - Quarterly report [Sections 13 or 15(d)]

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.

FORM 10-Q


☒			QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
			For the quarterly report ended July 1, 2023
			OR
☐			TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
			For the transition period from ______ to ______
			Commission file number 1-6770

MUELLER INDUSTRIES INC.

(Exact name of registrant as specified in its charter)


Delaware			25-0790410
(State or other jurisdiction of incorporation or organization)			(I.R.S. Employer Identification No.)


150 Schilling Boulevard	Suite 100
Collierville	Tennessee	38017
(Address of principal executive offices)		(Zip Code)

(901) 753-3200

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol	Name of exchange on which registered
Common Stock	MLI	NYSE

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.


Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ No ☒

The number of shares of the Registrant’s common stock outstanding as of July 21, 2023 was 56,778,790.

MUELLER INDUSTRIES, INC.

FORM 10-Q

For the Quarterly Period Ended July 1, 2023

As used in this report, the terms “Company,” “Mueller,” and “Registrant” mean Mueller Industries, Inc. and its consolidated subsidiaries taken as a whole, unless the context indicates otherwise.

INDEX


		Page Number
Part I. Financial Information

	Item 1. – Financial Statements (Unaudited)

	a.) Condensed Consolidated Statements of Income	3

	b.) Condensed Consolidated Statements of Comprehensive Income	4

	c.) Condensed Consolidated Balance Sheets	5

	d.) Condensed Consolidated Statements of Cash Flows	6

	e.) Condensed Consolidated Statements of Changes in Equity	8

	f.) Notes to Condensed Consolidated Financial Statements	10

	Item 2. – Management's Discussion and Analysis of Financial Condition and Results of Operations	26

	Item 3. – Quantitative and Qualitative Disclosures About Market Risk	35

	Item 4. – Controls and Procedures	37

Part II. Other Information

	Item 1. – Legal Proceedings	37

	Item 1A. – Risk Factors	37

	Item 2. – Unregistered Sales of Equity Securities and Use of Proceeds	38

	Item 5. – Other Information	37

	Item 6. – Exhibits	39

Signatures		40

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

MUELLER INDUSTRIES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)


	For the Quarter Ended				For the Six Months Ended
(In thousands, except per share data)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Net sales	$	896,984	$	1,150,042	$	1,868,176	$	2,160,044

Cost of goods sold	639,272		820,914		1,318,070		1,565,425
Depreciation and amortization	10,416		11,302		21,073		22,143
Selling, general, and administrative expense	56,062		48,956		108,693		96,412
Gain on sale of assets	—		—		—		(5,507)



Gain on insurance settlement	(19,466)		—		(19,466)		—

Operating income	210,700		268,870		439,806		481,571

Interest expense	(135)		(147)		(278)		(305)
Interest income	7,732		103		13,967		263
Unrealized gain on short-term investments	20,820		—		20,820		—
Other income, net	1,841		2,100		4,077		2,720

Income before income taxes	240,958		270,926		478,392		484,249

Income tax expense	(62,122)		(68,290)		(123,479)		(122,489)
Income (loss) from unconsolidated affiliates, net of foreign tax	715		4,888		(269)		5,012

Consolidated net income	179,551		207,524		354,644		366,772

Net income attributable to noncontrolling interests	(1,840)		(972)		(3,694)		(1,904)

Net income attributable to Mueller Industries, Inc.	$	177,711	$	206,552	$	350,950	$	364,868

Weighted average shares for basic earnings per share	55,660		55,787		55,677		55,943
Effect of dilutive stock-based awards	1,340		741		1,023		776

Adjusted weighted average shares for diluted earnings per share	57,000		56,528		56,700		56,719

Basic earnings per share	$	3.19	$	3.70	$	6.30	$	6.52

Diluted earnings per share	$	3.12	$	3.65	$	6.19	$	6.43

Dividends per share	$	0.30	$	0.25	$	0.60	$	0.50

See accompanying notes to condensed consolidated financial statements.

MUELLER INDUSTRIES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Consolidated net income	$	179,551	$	207,524	$	354,644	$	366,772

Other comprehensive income (loss), net of tax:
Foreign currency translation	7,725		(17,120)		17,976		(15,907)
Net change with respect to derivative instruments and hedging activities, net of tax of $775, $3,450, $503, and $2,846	(2,679)		(11,886)		(1,725)		(9,795)
Net change in pension and postretirement obligation adjustments, net of tax of $1, $31, $12, and $(103)	9		(299)		1		121
Attributable to unconsolidated affiliates, net of tax of $(103), $(656), $(476), and $(1,280)	353		2,261		1,638		4,409

Total other comprehensive income (loss), net	5,408		(27,044)		17,890		(21,172)

Consolidated comprehensive income	184,959		180,480		372,534		345,600
Comprehensive (income) loss attributable to noncontrolling interests	(1,546)		584		(3,658)		(315)

Comprehensive income attributable to Mueller Industries, Inc.	$	183,413	$	181,064	$	368,876	$	345,285

See accompanying notes to condensed consolidated financial statements.

MUELLER INDUSTRIES, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS


	(Unaudited)
(In thousands, except share data)	July 1, 2023		December 31, 2022
Assets
Current assets:
Cash and cash equivalents	$	771,317	$	461,018
Short-term investments	127,051		217,863
Accounts receivable, less allowance for doubtful accounts of $2,905 in 2023 and $2,687 in 2022	459,467		380,352
Inventories	465,729		448,919
Other current assets	28,172		26,501

Total current assets	1,851,736		1,534,653

Property, plant, and equipment, net	386,928		379,950
Operating lease right-of-use assets	31,164		22,892
Goodwill, net	158,769		157,588
Intangible assets, net	52,926		54,785
Investments in unconsolidated affiliates	73,412		72,364
Other assets	21,485		20,167

Total assets	$	2,576,420	$	2,242,399

Liabilities
Current liabilities:
Current portion of debt	$	670	$	811
Accounts payable	155,096		128,000
Accrued wages and other employee costs	45,148		61,915
Current portion of operating lease liabilities	6,951		4,942
Other current liabilities	136,683		152,627

Total current liabilities	344,548		348,295

Long-term debt, less current portion	1,267		1,218
Pension liabilities	2,929		4,078
Postretirement benefits other than pensions	9,237		8,977
Environmental reserves	15,729		16,380
Deferred income taxes	18,821		16,258
Noncurrent operating lease liabilities	23,596		16,880
Other noncurrent liabilities	17,355		16,349

Total liabilities	433,482		428,435

Equity
Mueller Industries, Inc. stockholders' equity:
Preferred stock - $1.00 par value; shares authorized 5,000,000; none outstanding	—		—
Common stock - $.01 par value; shares authorized 100,000,000; issued 80,183,004; outstanding 56,777,485 in 2023 and 57,001,617 in 2022	802		802
Additional paid-in capital	309,705		297,270
Retained earnings	2,376,618		2,059,796
Accumulated other comprehensive loss	(46,249)		(64,175)
Treasury common stock, at cost	(524,646)		(502,779)

Total Mueller Industries, Inc. stockholders' equity	2,116,230		1,790,914
Noncontrolling interests	26,708		23,050

Total equity	2,142,938		1,813,964

Commitments and contingencies	—		—

Total liabilities and equity	$	2,576,420	$	2,242,399

See accompanying notes to condensed consolidated financial statements.

MUELLER INDUSTRIES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)


	For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022

Cash flows from operating activities
Consolidated net income	$	354,644	$	366,772
Reconciliation of consolidated net income to net cash provided by operating activities:
Depreciation and amortization	21,252		22,322
Stock-based compensation expense	12,459		5,171
Provision for doubtful accounts receivable	(80)		151
Loss (income) from unconsolidated affiliates	269		(5,012)
Insurance proceeds - noncapital related	9,854		—

Gain on disposals of properties	(141)		(6,800)

Unrealized gain on short-term investments	(20,820)		—


Gain on insurance settlement	(19,466)		—

Deferred income tax expense (benefit)	2,406		(373)
Changes in assets and liabilities:
Receivables	(77,701)		(146,438)
Inventories	(12,149)		(49,354)
Other assets	(5,571)		(6,095)
Current liabilities	(14,460)		28,906
Other liabilities	(976)		(4,283)
Other, net	1,310		(433)

Net cash provided by operating activities	250,830		204,534

Cash flows from investing activities
Capital expenditures	(29,221)		(23,248)



Insurance proceeds - capital related	24,646		—
Purchase of short-term investments	(106,231)		—
Proceeds from the maturity of short-term investments	217,863		—

Proceeds from sales of assets	142		7,561
Dividends from unconsolidated affiliates	797		1,609

Net cash provided by (used in) investing activities	107,996		(14,078)

MUELLER INDUSTRIES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)


	For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022

Cash flows from financing activities
Dividends paid to stockholders of Mueller Industries, Inc.	(33,402)		(27,968)

Repurchase of common stock	(19,303)		(33,469)


Repayments of debt	(130)		(111)
(Repayment) issuance of debt by consolidated joint ventures, net	(143)		360
Net cash used to settle stock-based awards	(2,588)		(95)


Net cash used in financing activities	(55,566)		(61,283)

Effect of exchange rate changes on cash	4,825		(2,234)

Increase in cash, cash equivalents, and restricted cash	308,085		126,939
Cash, cash equivalents, and restricted cash at the beginning of the period	465,296		90,376

Cash, cash equivalents, and restricted cash at the end of the period	$	773,381	$	217,315

See accompanying notes to condensed consolidated financial statements.

MUELLER INDUSTRIES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(Unaudited)


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Common stock:
Balance at beginning of period	$	802	$	802	$	802	$	802

Balance at end of period	$	802	$	802	$	802	$	802

Additional paid-in capital:
Balance at beginning of period	$	303,133	$	288,802	$	297,270	$	286,208
Acquisition (issuance) of shares under incentive stock option plans	208		272		434		293
Stock-based compensation expense	6,822		2,598		12,459		5,171
Issuance of restricted stock	(458)		(444)		(458)		(444)

Balance at end of period	$	309,705	$	291,228	$	309,705	$	291,228

Retained earnings:
Balance at beginning of period	$	2,215,939	$	1,602,496	$	2,059,796	$	1,458,489
Net income attributable to Mueller Industries, Inc.	177,711		206,552		350,950		364,868
Dividends paid or payable to stockholders of Mueller Industries, Inc.	(17,032)		(14,237)		(34,128)		(28,546)



Balance at end of period	$	2,376,618	$	1,794,811	$	2,376,618	$	1,794,811

Accumulated other comprehensive loss:
Balance at beginning of period	$	(51,951)	$	(47,442)	$	(64,175)	$	(53,347)
Total other comprehensive income (loss) attributable to Mueller Industries, Inc.	5,702		(25,488)		17,926		(19,583)


Balance at end of period	$	(46,249)	$	(72,930)	$	(46,249)	$	(72,930)

MUELLER INDUSTRIES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(Unaudited)


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Treasury stock:
Balance at beginning of period	$	(505,616)	$	(474,258)	$	(502,779)	$	(470,034)
(Acquisition) issuance of shares under incentive stock option plans	(185)		(137)		(3,022)		(389)
Repurchase of common stock	(19,303)		(29,497)		(19,303)		(33,469)
Issuance of restricted stock	458		444		458		444

Balance at end of period	$	(524,646)	$	(503,448)	$	(524,646)	$	(503,448)

Noncontrolling interests:
Balance at beginning of period	$	25,162	$	35,744	$	23,050	$	34,845

Net income attributable to noncontrolling interests	1,840		972		3,694		1,904
Foreign currency translation	(294)		(1,556)		(36)		(1,589)

Balance at end of period	$	26,708	$	35,160	$	26,708	$	35,160

See accompanying notes to condensed consolidated financial statements.

MUELLER INDUSTRIES, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

General

Certain information and note disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) have been condensed or omitted. Results of operations for the interim periods presented are not necessarily indicative of results which may be expected for any other interim period or for the year as a whole. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K, including the annual financial statements incorporated therein.

The accompanying unaudited interim financial statements include all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the results for the interim periods presented herein.

Note 1 – Recent Accounting Standards

Adopted

In October 2021, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2021-08, Business Combinations (Topic 805): An Amendment of the FASB Accounting Standards Codification. The new guidance was issued to improve accounting for acquired revenue contracts with customers in a business combination by addressing diversity in practice and inconsistency related to the (i) recognition of an acquired contract liability, and (ii) payment terms and their effect on subsequent revenue recognized by the acquirer. The ASU is effective for fiscal years beginning after December 15, 2022 for public entities. The updated guidance requires prospective adoption, and early adoption is permitted. The Company adopted the ASU during the first quarter of 2023. The adoption of the ASU did not have a material impact on the Company’s Condensed Consolidated Financial Statements.

Issued

In June 2022, the FASB issued ASU No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. The new guidance was issued to clarify existing guidance measuring the fair value of an equity security subject to contractual restrictions that prohibit the sale of an equity security and introduce new disclosure requirements for applicable equity securities. The ASU is effective for fiscal years beginning after December 15, 2023 for public entities. The updated guidance requires prospective adoption, and early adoption is permitted. The Company does not expect the adoption of the ASU to have a material impact on its Condensed Consolidated Financial Statements.

Note 2 – Earnings per Common Share

Basic per share amounts have been computed based on the average number of common shares outstanding. Diluted per share amounts reflect the increase in average common shares outstanding that would result from the assumed exercise of outstanding stock options and vesting of restricted stock awards, computed using the treasury stock method. There were no stock-based awards excluded from the computation of diluted earnings per share for the quarter ended July 1, 2023 because they were antidilutive. Approximately eight thousand stock-based awards were excluded from the computation of diluted earnings per share for the quarter ended June 25, 2022 because they were antidilutive.

Note 3 – Segment Information

Each of the Company’s reportable segments is composed of certain operating segments that are aggregated primarily by the nature of products offered as follows:

Piping Systems

Piping Systems is composed of the following operating segments: Domestic Piping Systems Group, Great Lakes Copper, Heatlink Group, European Operations, Trading Group, Jungwoo-Mueller (the Company’s South Korean joint venture), and Mueller Middle East (the Company’s Bahraini joint venture). The Domestic Piping Systems Group manufactures and distributes copper tube, fittings, and line sets. These products are manufactured in the U.S., sold in the U.S., and exported to markets worldwide. Outside the U.S., Great Lakes Copper manufactures copper tube and line sets in Canada and sells the

products primarily in the U.S. and Canada. Heatlink Group produces a complete line of products for PEX plumbing and radiant systems in Canada and sells these products in Canada and the U.S. European Operations manufactures copper tube in the U.K. which is sold primarily in Europe. The Trading Group manufactures pipe nipples and resells brass and plastic plumbing valves, malleable iron fittings, faucets, and plumbing specialty products in the U.S. and Mexico. Jungwoo-Mueller manufactures copper-based joining products that are sold worldwide. Mueller Middle East manufactures copper tube and serves markets in the Middle East and Northern Africa. The Piping Systems segment’s products are sold primarily to plumbing, refrigeration, and air-conditioning wholesalers, hardware wholesalers and co-ops, building product retailers, and air-conditioning original equipment manufacturers (OEMs).

Industrial Metals

Industrial Metals is composed of the following operating segments: Brass Rod, Impacts & Micro Gauge, Brass Value-Added Products, and Precision Tube. These businesses manufacture brass rod, impact extrusions, and forgings, specialty copper, copper alloy, and aluminum tube, as well as a wide variety of end products including plumbing brass, automotive components, valves, fittings, and gas assemblies. These products are manufactured in the U.S. and sold primarily to OEMs in the U.S., many of which are in the industrial, transportation, construction, heating, ventilation, and air-conditioning, plumbing, refrigeration, and energy markets.

Climate

Climate is composed of the following operating segments: Refrigeration Products, Westermeyer, Turbotec, Flex Duct, and Linesets, Inc. The segment manufactures and sells refrigeration valves and fittings, high pressure components, coaxial heat exchangers, insulated HVAC flexible duct systems, and line sets primarily for the heating, ventilation, air-conditioning, and refrigeration markets in the U.S.

Summarized segment information is as follows:


	For the Quarter Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	638,005	$	146,266	$	123,954	$	(11,241)	$	896,984

Cost of goods sold	452,866		123,097		77,064		(13,755)		639,272
Depreciation and amortization	5,252		1,804		2,202		1,158		10,416
Selling, general, and administrative expense	28,745		3,394		7,087		16,836		56,062




Gain on insurance settlement	—		—		(19,466)		—		(19,466)

Operating income	151,142		17,971		57,067		(15,480)		210,700

Interest expense									(135)
Interest income									7,732
Unrealized gain on short-term investments									20,820
Other income, net									1,841

Income before income taxes									$	240,958

Segment information (continued):


	For the Quarter Ended June 25, 2022
(In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	824,807	$	179,175	$	164,484	$	(18,424)	$	1,150,042

Cost of goods sold	585,090		150,940		103,110		(18,226)		820,914
Depreciation and amortization	5,930		1,846		2,348		1,178		11,302
Selling, general, and administrative expense	22,208		2,221		8,279		16,248		48,956





Operating income	211,579		24,168		50,747		(17,624)		268,870

Interest expense									(147)
Interest income									103
Other income, net									2,100

Income before income taxes									$	270,926


	For the Six Months Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	1,300,484	$	311,500	$	276,908	$	(20,716)	$	1,868,176

Cost of goods sold	920,476		256,267		165,876		(24,549)		1,318,070
Depreciation and amortization	10,810		3,576		4,355		2,332		21,073
Selling, general, and administrative expense	54,202		6,471		15,088		32,932		108,693




Gain on insurance settlement	—		—		(19,466)		—		(19,466)

Operating income	314,996		45,186		111,055		(31,431)		439,806

Interest expense									(278)
Interest income									13,967
Unrealized gain on short-term investments									20,820
Other income, net									4,077

Income before income taxes									$	478,392

Segment information (continued):


	For the Six Months Ended June 25, 2022
( In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	1,528,237	$	353,487	$	305,106	$	(26,786)	$	2,160,044

Cost of goods sold	1,099,277		296,650		197,067		(27,569)		1,565,425
Depreciation and amortization	11,330		3,790		4,700		2,323		22,143
Selling, general, and administrative expense	45,563		5,620		15,892		29,337		96,412
Gain on sale of assets	—		—		—		(5,507)		(5,507)




Operating income	372,067		47,427		87,447		(25,370)		481,571

Interest expense									(305)
Interest income									263
Other income, net									2,720

Income before income taxes									$	484,249

The following table presents total assets attributable to each segment:


(In thousands)	July 1, 2023		December 31, 2022

Segment assets:
Piping Systems	$	1,218,810	$	1,088,940
Industrial Metals	165,534		160,702
Climate	263,666		279,940
General Corporate	928,410		712,817

	$	2,576,420	$	2,242,399

The following tables represent a disaggregation of revenue from contracts with customers, along with the reportable segment for each category:


	For the Quarter Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Total

Tube and fittings	$	518,712	$	—	$	—	$	518,712
Brass rod and forgings	—		113,563		—		113,563
OEM components, tube & assemblies	—		21,073		33,007		54,080
Valves and plumbing specialties	119,293		—		—		119,293
Flex duct and other HVAC components	—		—		90,947		90,947
Other	—		11,630		—		11,630

	638,005		146,266		123,954		908,225

Intersegment sales							(11,241)

Net sales							$	896,984


	For the Quarter Ended June 25, 2022
(In thousands)	Piping Systems		Industrial Metals		Climate		Total

Tube and fittings	$	674,579	$	—	$	—	$	674,579
Brass rod and forgings	—		142,788		—		142,788
OEM components, tube & assemblies	—		20,254		32,526		52,780
Valves and plumbing specialties	150,228		—		—		150,228
Flex duct and other HVAC components	—		—		131,958		131,958
Other	—		16,133		—		16,133

	824,807		179,175		164,484		1,168,466

Intersegment sales							(18,424)

Net sales							$	1,150,042

Disaggregation of revenue from contracts with customers (continued):


	For the Six Months Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Total

Tube and fittings	$	1,062,940	$	—	$	—	$	1,062,940
Brass rod and forgings	—		243,903		—		243,903
OEM components, tube & assemblies	—		43,582		66,409		109,991
Valves and plumbing specialties	237,544		—		—		237,544
Flex duct and other HVAC components	—		—		210,499		210,499
Other	—		24,015		—		24,015

	1,300,484		311,500		276,908		1,888,892

Intersegment sales							(20,716)

Net sales							$	1,868,176


	For the Six Months Ended June 25, 2022
(In thousands)	Piping Systems	Industrial Metals	Climate	Total

Tube and fittings	1,246,089	—	—	1,246,089
Brass rod and forgings	—	279,321	—	279,321
OEM components, tube & assemblies	—	40,350	61,618	101,968
Valves and plumbing specialties	282,148	—	—	282,148
Flex duct and other HVAC components	—	—	243,488	243,488
Other	—	33,816	—	33,816

	1,528,237	353,487	305,106	2,186,830

Intersegment sales				(26,786)

Net sales				$	2,160,044

Note 4 – Cash, Cash Equivalents, and Restricted Cash


(In thousands)	July 1, 2023		December 31, 2022

Cash & cash equivalents	$	771,317	$	461,018
Restricted cash included within other current assets	1,962		4,176
Restricted cash included within other assets	102		102

Total cash, cash equivalents, and restricted cash	$	773,381	$	465,296

Amounts included in restricted cash relate to required deposits in brokerage accounts that facilitate the Company’s hedging activities as well as imprest funds for the Company’s self-insured workers’ compensation program.

Note 5 – Inventories


(In thousands)	July 1, 2023		December 31, 2022

Raw materials and supplies	$	158,302	$	133,189
Work-in-process	79,601		64,177
Finished goods	239,635		265,842
Valuation reserves	(11,809)		(14,289)

Inventories	$	465,729	$	448,919

Note 6 – Financial Instruments

Short-Term Investments

The fair value of short-term investments at July 1, 2023, consisting of marketable securities, approximates the carrying value on that date. These marketable securities are stated at fair value and classified as level 1 within the fair value hierarchy. This classification is defined as a fair value determined using observable inputs that reflect quoted prices in active markets for identical assets.

The fair value of short-term investments at December 31, 2022, consisting of U.S. treasury bills with maturities exceeding three months at the time of purchase, approximates the carrying value on that date. These treasury bills are stated at fair value and are classified as trading securities. The fair value of treasury bills is classified as level 1 within the fair value hierarchy. This classification is defined as a fair value determined using observable inputs that reflect quoted prices in active markets for identical assets.

Derivative Instruments and Hedging Activities

The Company’s earnings and cash flows are subject to fluctuations due to changes in commodity prices, foreign currency exchange rates, and interest rates. The Company uses derivative instruments such as commodity futures contracts, foreign currency forward contracts, and interest rate swaps to manage these exposures.

All derivatives are recognized in the Condensed Consolidated Balance Sheets at their fair values. On the date the derivative contract is entered into, it is either a) designated as a hedge of a forecasted transaction or the variability of cash flow to be paid (cash flow hedge) or b) not designated in a hedge accounting relationship, even though the derivative contract was executed to mitigate an economic exposure (economic hedge), as the Company does not enter into derivative contracts for trading purposes. Changes in the fair value of a derivative that is qualified, designated, and highly effective as a cash flow hedge are recorded in stockholders’ equity within AOCI, to the extent effective, until they are reclassified to earnings in the same period or periods during which the hedged transaction affects earnings. Changes in the fair value of undesignated derivatives executed as economic hedges are reported in current earnings.

The Company documents all relationships between derivative instruments and hedged items, as well as the risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivative instruments that are designated as fair value hedges to specific assets and liabilities in the Condensed Consolidated Balance Sheets and linking cash flow hedges to specific forecasted transactions or variability of cash flow.

The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the designated derivative instruments that are used in hedging transactions are highly effective in offsetting changes in cash flows or fair values of hedged items. When a derivative instrument is determined not to be highly effective as a hedge or the underlying hedged transaction is no longer probable of occurring, hedge accounting is discontinued prospectively in accordance with the derecognition criteria for hedge accounting.

Commodity Futures Contracts

Copper and brass represent the largest component of the Company’s variable costs of production. The cost of these materials is subject to global market fluctuations caused by factors beyond the Company’s control. The Company occasionally enters into

forward fixed-price arrangements with certain customers; the risk of these arrangements is generally managed with commodity futures contracts. These futures contracts have been designated as cash flow hedges.

At July 1, 2023, the Company held open futures contracts to purchase approximately $24.7 million of copper over the next nine months related to fixed price sales orders. The fair value of those futures contracts was a $0.5 million net loss position, which was determined by obtaining quoted market prices (level 1 within the fair value hierarchy). In the next 12 months, the Company will reclassify into earnings realized gains or losses relating to cash flow hedges. At July 1, 2023, this amount was approximately $0.4 million of deferred net losses, net of tax.

The Company may also enter into futures contracts to protect the value of inventory against market fluctuations. At July 1, 2023, the Company held $0.5 million open futures contracts to sell copper over the next 11 months related to copper inventory. The fair value of those futures contracts was a $3 thousand net gain position, which was determined by obtaining quoted market prices (level 1 within the fair value hierarchy).

The Company presents its derivative assets and liabilities in the Condensed Consolidated Balance Sheets on a net basis by counterparty. The following table summarizes the location and fair value of the derivative instruments and disaggregates the net derivative assets and liabilities into gross components on a contract-by-contract basis:


	Asset Derivatives					Liability Derivatives
		Fair Value					Fair Value
(In thousands)	Balance Sheet Location	July 1, 2023		December 31, 2022		Balance Sheet Location	July 1, 2023		December 31, 2022

Commodity contracts - gains	Other current assets	$	74	$	3,746	Other current liabilities	$	305	$	—
Commodity contracts - losses	Other current assets	(9)		(1,483)		Other current liabilities	(814)		—

Total derivatives (1)		$	65	$	2,263		$	(509)	$	—

(1) Does not include the impact of cash collateral provided to counterparties.

The following tables summarize the effects of derivative instruments on the Company’s Condensed Consolidated Statements of Income:

For the Quarter Ended

For the Six Months Ended

(In thousands)

Location

July 1, 2023

June 25, 2022

July 1, 2023

June 25, 2022

Undesignated derivatives:

Gain (loss) on commodity contracts (nonqualifying)

Cost of goods sold

427

12,457

(2,057)

15,882

The following tables summarize amounts recognized in and reclassified from AOCI during the period:


	For the Quarter Ended July 1, 2023
(In thousands)	(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	(1,961)	Cost of goods sold	$	(742)
Other	24		Other	—

Total	$	(1,937)	Total	$	(742)

Amounts recognized in and reclassified from AOCI (continued):


	For the Quarter Ended June 25, 2022
(In thousands)	(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	(11,107)	Cost of goods sold	$	(792)
Other	13		Other	—

Total	$	(11,094)	Total	$	(792)


	For the Six Months Ended July 1, 2023
(In thousands)	Gain (Loss) Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	1,008	Cost of goods sold	$	(2,731)
Other	(2)		Other	—

Total	$	1,006	Total	$	(2,731)


	For the Six Months Ended June 25, 2022
(In thousands)	(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	(7,326)	Cost of goods sold	$	(2,514)
Other	45		Other	—

Total	$	(7,281)	Total	$	(2,514)

The Company primarily enters into International Swaps and Derivatives Association master netting agreements with major financial institutions that permit the net settlement of amounts owed under their respective derivative contracts. Under these master netting agreements, net settlement generally permits the Company or the counterparty to determine the net amount payable for contracts due on the same date and in the same currency for similar types of derivative transactions. The master netting agreements generally also provide for net settlement of all outstanding contracts with a counterparty in the case of an event of default or a termination event. The Company does not offset fair value amounts for derivative instruments and fair value amounts recognized for the right to reclaim cash collateral. At July 1, 2023 and December 31, 2022, the Company had recorded restricted cash in other current assets of $1.9 million and $4.0 million, respectively, as collateral related to open derivative contracts under the master netting arrangements.

Long-Term Debt

The fair value of long-term debt at July 1, 2023 approximates the carrying value on that date. The estimated fair values were determined based on quoted market prices and the current rates offered for debt with similar terms and maturities. The fair

value of long-term debt is classified as level 2 within the fair value hierarchy. This classification is defined as a fair value determined using market-based inputs other than quoted prices that are observable for the liability, either directly or indirectly.

Note 7 – Investments in Unconsolidated Affiliates

Tecumseh

The Company owns a 50 percent interest in an unconsolidated affiliate that acquired Tecumseh Products Company LLC (Tecumseh) and an entity that provides financing to Tecumseh. This investment is recorded using the equity method of accounting, as the Company can exercise significant influence but does not own a majority equity interest or otherwise control the entity. Under the equity method of accounting, this investment is stated at initial cost and is adjusted for subsequent additional investments and the Company’s proportionate share of earnings or losses and distributions.

The Company records its proportionate share of the investee’s net income or loss, net of foreign taxes, one quarter in arrears as income (loss) from unconsolidated affiliates, net of foreign tax, in the Condensed Consolidated Statements of Income and its proportionate share of the investee’s other comprehensive income (loss), net of income taxes, in the Condensed Consolidated Statements of Comprehensive Income and the Condensed Consolidated Statements of Changes in Equity. The U.S. tax effect of the Company’s proportionate share of Tecumseh’s income or loss is recorded in income tax expense in the Condensed Consolidated Statements of Income. In general, the equity investment in unconsolidated affiliates is equal to the current equity investment plus the investee’s net accumulated losses.

The following tables present summarized financial information derived from the Company’s equity method investee’s consolidated financial statements, which are prepared in accordance with U.S. GAAP.


(In thousands)	July 1, 2023		December 31, 2022

Current assets	$	230,018	$	248,808
Noncurrent assets	94,763		77,395
Current liabilities	182,462		190,746
Noncurrent liabilities	51,391		43,003


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Net sales	$	111,741	$	126,337	$	225,159	$	252,304
Gross profit	22,822		26,257		42,638		45,032
Net (loss) income	(1,244)		7,375		(5,961)		6,169

The Company’s income from unconsolidated affiliates, net of foreign tax, for the quarter ended July 1, 2023 included net losses of $0.6 million for Tecumseh. The Company’s loss from unconsolidated affiliates, net of foreign tax, for the six months ended July 1, 2023 included net losses of $3.0 million for Tecumseh.

The Company’s income from unconsolidated affiliates, net of foreign tax, for the quarter and six months ended June 25, 2022 included net income of $3.7 million and $3.1 million, respectively, for Tecumseh.

Retail Distribution

The Company owns a 17 percent noncontrolling equity interest in a limited liability company in the retail distribution business. This investment is recorded using the equity method of accounting. The Company records its proportionate share of the investee’s net income or loss one month in arrears as income (loss) from unconsolidated affiliates in the Condensed Consolidated Statements of Income. The Company’s proportionate share of the investee’s other comprehensive income (loss), net of income taxes, is recorded in the Condensed Consolidated Statements of Comprehensive Income and Condensed Consolidated Statement of Changes in Equity.

The Company’s income from unconsolidated affiliates, net of foreign tax, for the quarter ended July 1, 2023 included net income of $1.3 million for the retail distribution business. The Company’s loss from unconsolidated affiliates, net of foreign tax, for the six months ended July 1, 2023 included net income of $2.7 million for the retail distribution business.

The Company’s income from unconsolidated affiliates, net of foreign tax, for the quarter and six months ended June 25, 2022 included net income of $1.2 million and $1.9 million, respectively, for the retail distribution business.

Note 8 – Benefit Plans

The Company sponsors several qualified and nonqualified pension plans and other postretirement benefit plans for certain of its employees. The components of net periodic benefit cost (income) are as follows:


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Pension benefits:

Interest cost	$	595	$	393	$	1,189	$	787
Expected return on plan assets	(842)		(967)		(1,683)		(1,934)
Amortization of net loss	—		243		—		487

Net periodic benefit income	$	(247)	$	(331)	$	(494)	$	(660)

Other benefits:
Service cost	$	50	$	72	$	101	$	144
Interest cost	128		103		256		206
Amortization of prior service cost (credit)	—		(79)		(1)		(197)
Amortization of net gain	(99)		(60)		(196)		(118)
Curtailment gain	—		$	(1,756)	—		$	(1,756)

Net periodic benefit cost (income)	$	79	$	(1,720)	$	160	$	(1,721)

The components of net periodic benefit cost (income) other than the service cost component are included in other income, net in the Condensed Consolidated Statements of Income.

Note 9 – Commitments and Contingencies

The Company is involved in certain litigation as a result of claims that arose in the ordinary course of business, which management believes will not have a material adverse effect on the Company’s financial position, results of operations, or cash flows. The Company may also realize the benefit of certain legal claims and litigation in the future; these gain contingencies are not recognized in the Condensed Consolidated Financial Statements.

Environmental

Non-operating Properties

Southeast Kansas Sites

The Kansas Department of Health and Environment (KDHE) has contacted the Company regarding environmental contamination at three former smelter sites in Kansas (Altoona, East La Harpe, and Lanyon). The Company is not a successor to the companies that operated these smelter sites, but is exploring possible settlement with KDHE and other potentially responsible parties (PRP) in order to avoid litigation.

In February 2022, the Company reached a settlement with another PRP relating to these three sites. Under the terms of that agreement, the Company paid $5.6 million, which was previously reserved, in exchange for the other PRP’s agreement to conduct or fund any required remediation within the geographic boundaries of the three sites (namely, the parcel(s) on which the former smelters were located), plus coverage of certain off-site areas (namely, contamination that migrated by surface water runoff or air emissions from the Altoona or East La Harpe site, and smelter materials located within 50 feet of the geographic boundary of each site). The settlement does not cover certain matters, including potential liability related to the remediation of the town of Iola which is not estimable at this time. The other PRP will also provide an indemnity that would cover third-party cleanup claims for those sites, subject to a time limit and a cap.

Altoona. Another PRP conducted a site investigation of the Altoona site under a consent decree with KDHE and submitted a removal site evaluation report recommending a remedy. The remedial design plan, which covers both on-site and certain off-site cleanup costs, was approved by the KDHE in 2016. Construction of the remedy was completed in 2018. Under the terms of the settlement with the other PRP, the Company expects the operations and maintenance costs for this remedy to be paid for entirely by the other PRP.

East La Harpe. At the East La Harpe site, the Company and two other PRPs conducted a site study evaluation under KDHE supervision and prepared a site cleanup plan approved by KDHE. In December 2018, KDHE provided a draft agreement which contemplates the use of funds KDHE obtained from two other parties (Peabody Energy and Blue Tee) to fund part of the remediation, and removes Blue Tee from the PRPs’ agreement with KDHE. Pursuant to the terms of the settlement with the other PRP noted above, the Company expects the remediation to be conducted and paid for entirely by the other PRP, and for the other PRP to negotiate and enter into an agreement with KDHE.

Lanyon. With respect to the Lanyon Site, in 2016, the Company received a general notice letter from the United States Environmental Protection Agency (EPA) asserting that the Company is a PRP, which the Company has denied. EPA issued an interim record of decision in 2017 and has been remediating properties at the site. According to EPA, 1,371 properties in total will be remediated, and the work will continue into 2023.

Shasta Area Mine Sites

Mining Remedial Recovery Company (MRRC), a wholly owned subsidiary, owns certain inactive mines in Shasta County, California. MRRC has continued a program, begun in the late 1980s, of implementing various remedial measures, including sealing mine portals with concrete plugs in portals that were discharging water. The sealing program achieved significant reductions in the metal load in discharges from these adits; however, additional reductions are required pursuant to an order issued by the California Regional Water Quality Control Board (QCB). In response to a 1996 QCB Order, MRRC completed a feasibility study in 1997 describing measures designed to mitigate the effects of acid rock drainage. In December 1998, the QCB modified the 1996 order extending MRRC’s time to comply with water quality standards. In September 2002, the QCB adopted a new order requiring MRRC to adopt Best Management Practices (BMP) to control discharges of acid mine drainage, and again extended the time to comply with water quality standards until September 2007. During that time, implementation of BMP further reduced impacts of acid rock drainage; however, full compliance has not been achieved. The QCB is presently renewing MRRC’s discharge permit and will concurrently issue a new order. It is expected that the new 10-year permit will include an order requiring continued implementation of BMP through 2033 to address residual discharges of acid rock drainage. The Company currently estimates that it will spend between approximately $14.1 million and $16.1 million for remediation at these sites over the next 30 years and has accrued a reserve at the low end of this range.

Lead Refinery Site

U.S.S. Lead Refinery, Inc. (Lead Refinery), a non-operating wholly owned subsidiary of MRRC, has conducted corrective action and interim remedial activities (collectively, Site Activities) at Lead Refinery’s East Chicago, Indiana site pursuant to the Resource Conservation and Recovery Act since December 1996. Although the Site Activities have been substantially concluded, Lead Refinery is required to perform monitoring and maintenance-related activities pursuant to a post-closure permit issued by the Indiana Department of Environmental Management effective as of March 2, 2013. Approximate costs to comply with the post-closure permit, including associated general and administrative costs, are estimated at between $1.6 million and $2.4 million over the next 14 years. The Company has recorded a reserve at the low end of this range.

On April 9, 2009, pursuant to the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), the U.S. Environmental Protection Agency (EPA) added the Lead Refinery site and surrounding properties to the National Priorities List (NPL). On July 17, 2009, Lead Refinery received a written notice from the EPA indicating that it may be a PRP under CERCLA due to the release or threat of release of hazardous substances including lead into properties surrounding the Lead Refinery NPL site. The EPA identified two other PRPs in connection with that matter. In November 2012, the EPA

adopted a remedy for the surrounding properties and in September 2014, the EPA announced that it had entered into a settlement with the two other PRPs whereby they will pay approximately $26.0 million to fund the cleanup of approximately 300 properties surrounding the Lead Refinery NPL site (zones 1 and 3 of operable unit 1) and perform certain remedial action tasks.

On November 8, 2016, the Company, its subsidiary Arava Natural Resources Company, Inc. (Arava), and Arava’s subsidiary MRRC each received general notice letters from the EPA asserting that they may be PRPs in connection with the Lead Refinery NPL site. The Company, Arava, and MRRC have denied liability for any remedial action and response costs associated with the Lead Refinery NPL site. In June 2017, the EPA requested that Lead Refinery conduct, and the Company fund, a remedial investigation and feasibility study of operable unit 2 of the Lead Refinery NPL site pursuant to a proposed administrative settlement agreement and order on consent. The Company and Lead Refinery entered into that agreement in September 2017. The Company has made a capital contribution to Lead Refinery to conduct the remedial investigation and feasibility study with respect to operable unit 2 and has provided financial assurance in the amount of $1.0 million. The remedial investigation and feasibility study remain ongoing. The EPA has also asserted its position that Mueller is a responsible party for the Lead Refinery NPL site, and accordingly is responsible for a share of remedial action and response costs at the site and in the adjacent residential area.

In January 2018, the EPA issued two unilateral administrative orders (UAOs) directing the Company, Lead Refinery, and four other PRPs to conduct soil and interior remediation of certain residences at the Lead Refinery NPL site (zones 2 and 3 of operable unit 1). Subsequent thereto, the Company and Lead Refinery have reached agreement with the four other PRPs to implement these two UAOs, with the Company agreeing to pay, on an interim basis, (i) an estimated $4.5 million (subject to potential change through a future reallocation process) of the approximately $25.0 million the PRPs then estimated it would cost to implement the UAOs, which estimate is subject to change, and (ii) $2.0 million relating to past costs incurred by other PRPs for work conducted at the site, as well as the possibility of up to $0.7 million in further payments for ongoing work by those PRPs. As of July 1, 2023, the Company has made payments of approximately $7.6 million related to the aforementioned agreement with the other PRPs. The Company disputes that it was properly named in the UAOs. In March 2022, Lead Refinery entered into an administrative settlement agreement and order on consent with the EPA, along with the four other PRPs, which involves payment of certain past and future costs relating to operable unit 1, in exchange for certain releases and contribution protection for the Company, Lead Refinery, and their respective affiliates relating to that operable unit. The settlement became effective in September 2022. The Company reserved $3.3 million for this settlement at the end of 2021. In March 2018, a group of private plaintiffs sued the Company, Arava, MRRC, and Lead Refinery, along with other defendants, in civil tort action relating to the site. The Company, Arava, and MRRC have been voluntarily dismissed from that litigation without prejudice. Lead Refinery’s motion to dismiss the matter was granted without prejudice, but it has answered plaintiffs’ amended complaint. At this juncture, the Company is unable to determine the likelihood of a material adverse outcome or the amount or range of a potential loss in excess of the current reserve with respect to any remedial action or litigation relating to the Lead Refinery NPL site, either at Lead Refinery’s former operating site (operable unit 2) or the adjacent residential area (operable unit 1), including, but not limited to, EPA oversight costs for which the EPA may attempt to seek reimbursement from the Company, and past costs for which other PRPs may attempt to seek contribution from the Company.

Bonita Peak Mining District

Following an August 2015 spill from the Gold King Mine into the Animas River near Silverton, Colorado, the EPA listed the Bonita Peak Mining District on the NPL. Said listing was finalized in September 2016. The Bonita Peak Mining District encompasses 48 mining sites within the Animas River watershed, including the Sunnyside Mine, the American Tunnel, and the Sunbank Group. On or about July 25, 2017, Washington Mining Company (Washington Mining) (a wholly-owned subsidiary of the Company’s wholly-owned subsidiary, Arava), received a general notice letter from the EPA stating that Washington Mining may be a PRP under CERCLA in connection with the Bonita Peak Mining District site and therefore responsible for the remediation of certain portions of the site, along with related costs incurred by the EPA. Shortly thereafter, the Company received a substantively identical letter asserting that it may be a PRP at the site and similarly responsible for the cleanup of certain portions of the site. The general notice letters identify one other PRP at the site, and do not require specific action by Washington Mining or the Company at this time. At this juncture, the Company is unable to determine the likelihood of a materially adverse outcome or the amount or range of a potential loss with respect to any remedial action related to the Bonita Peak Mining District NPL site.

Operating Properties

Mueller Copper Tube Products, Inc.

In 1999, Mueller Copper Tube Products, Inc. (MCTP), a wholly owned subsidiary, commenced a cleanup and remediation of soil and groundwater at its Wynne, Arkansas plant to remove trichloroethylene, a cleaning solvent formerly used by MCTP. On

August 30, 2000, MCTP received approval of its Final Comprehensive Investigation Report and Storm Water Drainage Investigation Report addressing the treatment of soils and groundwater from the Arkansas Department of Environmental Quality (ADEQ). The Company established a reserve for this project in connection with the acquisition of MCTP in 1998. Effective November 17, 2008, MCTP entered into a Settlement Agreement and Administrative Order by Consent to submit a Supplemental Investigation Work Plan (SIWP) and subsequent Final Remediation Work Plan (RWP) for the site. By letter dated January 20, 2010, ADEQ approved the SIWP as submitted, with changes acceptable to the Company. On December 16, 2011, MCTP entered into an amended Administrative Order by Consent to prepare and implement a revised RWP regarding final remediation for the Site. The remediation system was activated in February 2014. Costs to implement the work plans, including associated general and administrative costs, are estimated to approximate $0.5 million to $0.7 million over the next three years. The Company has recorded a reserve at the low end of this range.

United States Department of Commerce Antidumping Review

On December 24, 2008, the Department of Commerce (DOC) initiated an antidumping administrative review of the antidumping duty order covering circular welded non-alloy steel pipe and tube from Mexico for the November 1, 2007 through October 31, 2008 period of review. The DOC selected Mueller Comercial as a respondent in the review. On April 19, 2010, the DOC published the final results of the review and assigned Mueller Comercial an antidumping duty rate of 48.33 percent. On May 25, 2010, the Company appealed the final results to the U.S. Court of International Trade (CIT). On December 16, 2011, the CIT issued a decision remanding the Department’s final results. While the matter was still pending, the Company and the United States reached an agreement to settle the appeal. Subject to the conditions of the agreement, the Company anticipated that certain of its subsidiaries would incur antidumping duties on subject imports made during the period of review and, as such, established a reserve for this matter. After the lapse of the statutory period of time during which U.S. Customs and Border Protection (CBP) was required, but failed, to liquidate the entries at the settled rate, the Company released the reserve. Between October 30, 2015 and November 27, 2015, CBP sent a series of invoices to Southland Pipe Nipples Co., Inc. (Southland), requesting payment of approximately $3.0 million in duties and interest in connection with 795 import entries made during the November 1, 2007 through October 31, 2008 period. On January 26, 2016 and January 27, 2016, Southland filed protests with CBP in connection with these invoices, noting that CBP’s asserted claims were not made in accordance with applicable law, including statutory provisions governing deemed liquidation. The Company believes in the merits of the legal objections raised in Southland’s protests, and CBP’s response to Southland’s protests is currently pending. Given the procedural posture and issues raised by this legal dispute, the Company cannot estimate the amount of potential duty liability, if any, that may result from CBP’s asserted claims.

Guarantees

Guarantees, in the form of letters of credit, are issued by the Company generally to assure the payment of insurance deductibles, certain retiree health benefits, and debt at certain unconsolidated affiliates. The terms of the guarantees are generally one year but are renewable annually as required. These letters are primarily backed by the Company’s revolving credit facility. The maximum payments that the Company could be required to make under its guarantees at July 1, 2023 were $28.9 million.

Note 10 – Income Taxes

The Company’s effective tax rate for the second quarter of 2023 was 26 percent compared with 25 percent for the same period last year. The primary items impacting the effective tax rate for the second quarter of 2023 were increases related to the provision for state income taxes, net of the federal benefit, of $7.1 million and the effect of foreign tax rates higher than statutory tax rates and other foreign adjustments of $2.6 million.

The items impacting the effective tax rate for the second quarter of 2022 were increases related to the provision for state income taxes, net of the federal benefit, of $9.8 million and the effect of foreign tax rates higher than statutory tax rates and other foreign adjustments of $1.7 million.

The Company’s effective tax rate for the first half of 2023 was 26 percent compared with 25 percent for the same period last year. The items impacting the effective tax rate for the first half of 2023 were primarily attributable to the provision for state income taxes, net of the federal benefit, of $15.0 million and the effect of foreign tax rates higher than statutory tax rates and other foreign items of $4.6 million.

The items impacting the effective tax rate for the first half of 2022 were primarily related to the provision for state income taxes, net of the federal benefit, of $16.9 million and the effect of foreign tax rates higher than statutory tax rates of $3.4 million.

The Company files a consolidated U.S. federal income tax return and numerous consolidated and separate-company income tax returns in many state, local, and foreign jurisdictions. The statute of limitations is open for the Company’s federal tax return for 2019 and all subsequent years. The statutes of limitations for most state returns are open for 2019 and all subsequent years, and some state and foreign returns are also open for some earlier tax years due to differing statute periods. While the Company believes that it is adequately reserved for possible audit adjustments, the final resolution of these examinations cannot be determined with certainty and could result in final settlements that differ from current estimates.

Note 11 – Accumulated Other Comprehensive Income (Loss)

AOCI includes certain foreign currency translation adjustments from those subsidiaries not using the U.S. dollar as their functional currency, net deferred gains and losses on certain derivative instruments accounted for as cash flow hedges, adjustments to pension and OPEB liabilities, and other comprehensive income attributable to unconsolidated affiliates.

The following tables provide changes in AOCI by component, net of taxes and noncontrolling interests (amounts in parentheses indicate debits to AOCI):


	For the Six Months Ended July 1, 2023
(In thousands)	Cumulative Translation Adjustment		Unrealized Gain (Loss) on Derivatives		Pension/OPEB Liability Adjustment		Attributable to Unconsol. Affiliates		Total

Balance as of December 31, 2022	$	(69,238)	$	1,486	$	1,222	$	2,355	$	(64,175)

Other comprehensive income before reclassifications	18,012		1,006		148		1,638		20,804
Amounts reclassified from AOCI	—		(2,731)		(147)		—		(2,878)

Net current-period other comprehensive income (loss)	18,012		(1,725)		1		1,638		17,926


Balance as of July 1, 2023	$	(51,226)	$	(239)	$	1,223	$	3,993	$	(46,249)


	For the Six Months Ended June 25, 2022
(In thousands)	Cumulative Translation Adjustment		Unrealized Gain (Loss) on Derivatives		Pension/OPEB Liability Adjustment		Attributable to Unconsol. Affiliates		Total

Balance as of December 25, 2021	$	(42,303)	$	803	$	(11,500)	$	(347)	$	(53,347)

Other comprehensive (loss) income before reclassifications	(14,318)		(7,281)		(31)		4,409		(17,221)
Amounts reclassified from AOCI	—		(2,514)		152		—		(2,362)

Net current-period other comprehensive (loss) income	(14,318)		(9,795)		121		4,409		(19,583)


Balance as of June 25, 2022	$	(56,621)	$	(8,992)	$	(11,379)	$	4,062	$	(72,930)

Reclassification adjustments out of AOCI were as follows:


	Amount reclassified from AOCI
	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022		Affected line item

Unrealized gains on derivative commodity contracts	$	(960)	$	(1,021)	$	(3,511)	$	(3,245)	Cost of goods sold

	218		229		780		731		Income tax expense

	$	(742)	$	(792)	$	(2,731)	$	(2,514)	Net of tax and noncontrolling interests

Amortization of net loss and prior service cost on employee benefit plans	$	(99)	$	104	$	(197)	$	172	Other income, net
	25		(15)		50		(20)		Income tax expense (benefit)

	$	(74)	$	89	$	(147)	$	152	Net of tax and noncontrolling interests

Note 12 – Insurance Claims

In August 2022, a portion of the Company’s Bluffs, Illinois manufacturing operation was damaged by fire. Certain inventories, production equipment, and building structures were extensively damaged. During the second quarter of 2023, the Company settled the claim with its insurer for total proceeds of $29.5 million, net of the deductible of $250 thousand. As a result of the settlement with the insurer, all proceeds received and all costs previously deferred (which were recorded as other current liabilities in prior periods) were recognized, resulting in a pre-tax gain of $19.5 million in the second quarter of 2023, or 26 cents per diluted share after tax. The Company received proceeds of $24.5 million and $5.0 million in 2023 and 2022, respectively.

In March 2023, a portion of the Company’s Covington, Tennessee manufacturing operation was damaged by a tornado. The extent of the damage to inventories, production equipment, and building structures is currently being assessed. The total value of the loss, including business interruption, cannot be determined at this time, but is expected to be covered by property and business interruption insurance subject to customary deductibles. Any gain resulting from insurance proceeds for property damage in excess of the net book value of the related property will be recognized in income upon settlement of the claim. In addition, the Company has deferred recognition of direct, identifiable costs associated with this matter. These costs will also be recognized upon settlement of the insurance claim. As of July 1, 2023, the Company has received advances totaling $10.0 million from the insurance company for this claim. These advances, net of the book value of damaged inventories, equipment, and buildings and direct cleanup and other out of pocket costs totaled $3.6 million, classified as other current liabilities on the Condensed Consolidated Balance Sheet at July 1, 2023.

Note 13 - Disposition

On September 2, 2021, the Company entered into a contribution agreement with a limited liability company in the retail distribution business, pursuant to which the Company exchanged the outstanding common stock of Die-Mold for a 17 percent equity interest in the limited liability company. Die-Mold manufactures PEX and other plumbing-related fittings and plastic injection tooling in Canada and sells these products in Canada and the U.S. and was included in the Piping Systems Segment.

Effective July 3, 2023, the Company transferred 100 percent of the outstanding shares of Heatlink Group, Inc. and Heatlink Group USA, LLC for an additional 11 percent equity interest in the limited liability company. During the third quarter, the Company will measure the gain or loss on the disposition by measuring the fair value of the consideration received (the 11

percent equity interest) against the carrying value of Heatlink Group, in accordance with Accounting Standards Codification 810-10, Consolidation. Any resulting gain or loss is expected to be immaterial to the Company’s Condensed Consolidated Financial Statements.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

General Overview

We are a leading manufacturer of copper, brass, aluminum, and plastic products. The range of products we manufacture is broad: copper tube and fittings; line sets; brass and copper alloy rod, bar, and shapes; aluminum and brass forgings; aluminum impact extrusions; PEX plastic tube and fittings; refrigeration valves and fittings; compressed gas valves; pressure vessels; steel nipples; and insulated flexible duct systems. We also resell brass and plastic plumbing valves, plastic fittings, malleable iron fittings, faucets, and plumbing specialty products. Our operations are located throughout the United States and in Canada, Mexico, Great Britain, South Korea, the Middle East, and China.

Each of our reportable segments is composed of certain operating segments that are aggregated primarily by the nature of products offered as follows:

•Piping Systems: The Piping Systems segment is composed of Domestic Piping Systems Group, Great Lakes Copper, Heatlink Group, European Operations, Trading Group, Jungwoo-Mueller (our South Korean joint venture), and Mueller Middle East (our Bahraini joint venture). The Domestic Piping Systems Group manufactures and distributes copper tube, fittings, and line sets. These products are manufactured in the U.S., sold in the U.S., and exported to markets worldwide. Great Lakes Copper manufactures copper tube and line sets in Canada and sells the products primarily in the U.S. and Canada. Heatlink Group manufactures a complete line of products for PEX plumbing and radiant systems in Canada and sells these products in Canada and the U.S. European Operations manufactures copper tube in the United Kingdom, which is sold throughout Europe. The Trading Group manufactures pipe nipples and sources products for import distribution in North America. Jungwoo-Mueller manufactures copper-based joining products that are sold worldwide. Mueller Middle East manufactures copper tube and serves markets in the Middle East and Northern Africa. The Piping Systems segment sells products to wholesalers in the plumbing and refrigeration markets, distributors to the manufactured housing and recreational vehicle industries, building material retailers, and air-conditioning original equipment manufacturers (OEMs).

•Industrial Metals: The Industrial Metals segment is composed of Brass Rod, Impacts & Micro Gauge, Brass Value-Added Products, and Precision Tube. The segment manufactures and sells brass rod, bar, and shapes; aluminum and brass forgings; aluminum impact extrusions; gas valves and assemblies; and specialty copper, copper alloy, and aluminum tube. The segment manufactures and sells its products primarily to domestic OEMs in the industrial, transportation, construction, heating, ventilation, and air-conditioning, plumbing, refrigeration, and energy markets.

•Climate: The Climate segment is composed of Refrigeration Products, Westermeyer, Turbotec, Flex Duct, and Linesets, Inc. The segment manufactures and sells refrigeration valves and fittings, high pressure components, coaxial heat exchangers, insulated HVAC flexible duct systems, and line sets. The segment sells its products primarily to the heating, ventilation, air-conditioning, and refrigeration markets in the U.S.

New housing starts and commercial construction are important determinants of our sales to the heating, ventilation, and air-conditioning, refrigeration, and plumbing markets because the principal end use of a significant portion of our products is in the construction of single and multi-family housing and commercial buildings. Repairs and remodeling projects are also important drivers of underlying demand for these products. In addition, our products are used in various transportation, automotive, and industrial applications.

According to the U.S. Census Bureau, the June 2023 seasonally adjusted annual rate of new housing starts was 1.43 million, compared to the June 2022 rate of 1.56 million. The average 30-year fixed mortgage rate was 6.44 percent for the first half of 2023 and 5.34 percent for the twelve months ended December 2022. The private non-residential construction sector includes offices, industrial, health care, and retail projects. According to the U.S. Census Bureau, the seasonally adjusted annual value of private nonresidential construction put in place was $655.8 billion in May 2023 compared to the May 2022 rate of $544.1 billion.

Profitability of certain of our product lines depends upon the “spreads” between the cost of raw material and the selling prices of our products. The open market prices for copper cathode and copper and brass scrap, for example, influence the selling price

of copper tube and brass rod, two principal products manufactured by the Company. We attempt to minimize the effects on profitability from fluctuations in material costs by passing through these costs to our customers; however, margins of our businesses that account for inventory on a FIFO basis may be impacted in periods of significant fluctuations in material costs. Our earnings and cash flow are dependent upon these spreads that fluctuate based upon market conditions.

Earnings and profitability are also impacted by unit volumes that are subject to market trends, such as substitute products, imports, technologies, and market share. We intensively manage our pricing structure while attempting to maximize profitability. From time-to-time, this practice results in lost sales opportunities and lower volume. For plumbing systems, plastics are the primary substitute product; these products represent an increasing share of consumption. For certain air-conditioning and refrigeration applications, aluminum-based systems are the primary substitution threat. We cannot predict the acceptance or the rate of switching that may occur. U.S. consumption of copper tube and brass rod is still predominantly supplied by U.S. manufacturers. In recent years, brass rod consumption in the U.S. has declined due to the outsourcing of many manufactured products to offshore regions.

Results of Operations

Consolidated Results

The following table compares summary operating results for the first half of 2023 and 2022:


	For the Quarter Ended				Percent Change		For the Six Months Ended				Percent Change
(In thousands)	July 1, 2023		June 25, 2022		2023 vs. 2022		July 1, 2023		June 25, 2022		2023 vs. 2022

Net sales	$	896,984	$	1,150,042	(22.0)	%	$	1,868,176	$	2,160,044	(13.5)	%
Operating income	210,700		268,870		(21.6)		439,806		481,571		(8.7)
Net income	177,711		206,552		(14.0)		350,950		364,868		(3.8)

The following are components of changes in net sales compared to the prior year:


	Quarter-to- Date		Year-to- Date
Net selling price in core product lines	(4.6)	%	(2.8)	%
Unit sales volume in core product lines	(11.8)		(8.1)


Other	(5.6)		(2.6)

	(22.0)	%	(13.5)	%

The decrease in net sales during the second quarter of 2023 was primarily due to (i) lower unit sales volume of $135.8 million in our core product lines, primarily copper tube, line sets, and brass rod, (ii) a decrease in sales of $64.9 million in our non-core product lines, and (iii) lower net selling prices of $52.4 million in our core product lines.

The decrease in net sales during the first half of 2023 was primarily due to (i) lower unit sales volume of $174.6 million in our core product lines, (ii) lower net selling prices of $61.0 million in our core product lines, and (iii) a decrease in sales of $56.2 million in our non-core product lines.

Net selling prices generally fluctuate with changes in raw material costs. Changes in raw material costs are generally passed through to customers by adjustments to selling prices. The following graph shows the Comex average copper price per pound by quarter for the current and prior fiscal years:

The following tables compare cost of goods sold and operating expenses as dollar amounts and as a percent of net sales for the first half of 2023 and 2022:


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Cost of goods sold	$	639,272	$	820,914	$	1,318,070	$	1,565,425
Depreciation and amortization	10,416		11,302		21,073		22,143
Selling, general, and administrative expense	56,062		48,956		108,693		96,412
Gain on sale of assets	—		—		—		(5,507)



Gain on insurance settlement	(19,466)		—		(19,466)		—

Operating expenses	$	686,284	$	881,172	$	1,428,370	$	1,678,473


	For the Quarter Ended				For the Six Months Ended
	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Cost of goods sold	71.3	%	71.4	%	70.6	%	72.5	%
Depreciation and amortization	1.2		1.0		1.1		1.0
Selling, general, and administrative expense	6.3		4.2		5.9		4.6
Gain on sale of assets	—		—		—		(0.3)



Gain on insurance settlement	(2.2)		—		(1.0)		—

Operating expenses	76.5	%	76.6	%	76.6	%	77.8	%

Q2 2023 compared to Q2 2022

Cost of goods sold decreased in the second quarter of 2023 primarily due to the factors noted above regarding the change in net sales. Gross margin as a percentage of sales was 28.7 percent compared with 28.6 percent in the prior year quarter. Depreciation and amortization decreased in the second quarter of 2023 primarily as a result of several long-lived assets becoming fully depreciated. Selling, general, and administrative expense increased in the second quarter of 2023 primarily as a result of (i) higher foreign currency transaction losses of $2.6 million, (ii) higher employment costs, including stock-based

compensation, of $1.3 million, (iii) gains on the disposal of assets of $1.3 million recorded in the prior year quarter, (iv) higher legal and professional fees of $0.9 million, (v) higher marketing and advertising costs of $0.5 million, and (vi) higher lease and rent expense of $0.4 million. In addition, during the second quarter of 2023, we settled the insurance claim related to the August 2022 fire at our Bluffs, Illinois manufacturing operation and recognized a $19.5 million gain.

Interest expense was consistent with the second quarter of 2022. Interest income was higher during the second quarter of 2023 primarily as a result of the purchase of short-term investments in the fourth quarter of 2022 and higher rates on deposits. During the second quarter of 2023, we recognized an unrealized gain on short-term investments of $20.8 million. Other income, net, decreased during the second quarter of 2023 primarily as a result of a settlement charge related to one of our foreign benefit plans recognized during the second quarter of 2023.

Our effective tax rate for the second quarter of 2023 was 26 percent compared with 25 percent for the same period last year. The items impacting the effective tax rate were (i) increases related to the provision for state income taxes, net of the federal benefit, of $7.1 million and (ii) the effect of foreign tax rates higher than statutory tax rates and other foreign items of $2.6 million.

For the second quarter of 2022, the difference between the effective tax rate and the amount computed using the U.S. federal statutory rate was primarily attributable to (i) the provision for state income taxes, net of the federal benefit, of $9.8 million and (ii) the effect of foreign tax rates higher than statutory tax rates and other foreign items of $1.7 million.

During the second quarter of 2023 and 2022, we recognized income of $0.7 million and $4.9 million, respectively, on our investments in unconsolidated affiliates.

YTD 2023 compared to YTD 2022

Cost of goods sold decreased in the first half of 2023 primarily due to the factors noted above regarding the change in net sales. Gross margin as a percentage of sales was 29.4 percent compared with 27.5 percent in the prior year. The combination of strong demand for our products, inflationary pressures, and industry wide supply constraints contributed to an environment of improved margins for the majority of our businesses. Depreciation and amortization decreased in the first half of 2023 primarily as a result of several long-lived assets becoming fully depreciated. Selling, general, and administrative expense increased in the first half of 2023 primarily as a result of (i) higher employment costs, including stock-based compensation, of $4.9 million, (ii) higher foreign currency transaction losses of $3.4 million, (iii) gains on the disposal of assets of $1.3 million recorded in the prior year, (iv) higher marketing and advertising costs of $1.2 million, (v) higher legal and professional fees of $0.9 million, and (vi) higher repairs and maintenance costs of $0.8 million. In addition, during the first half of 2023, we settled the insurance claim related to the August 2022 fire at our Bluffs, Illinois manufacturing operation and recognized a $19.5 million gain. During the first half of 2022 we recognized a gain of $5.5 million on the sale of a building.

Interest expense was consistent with the first half of 2022. Interest income was higher during the first half of 2023 primarily as a result of the purchase of short-term investments in the fourth quarter of 2022 and higher rates on deposits. During the first half of 2023, we recognized an unrealized gain on short-term investments of $20.8 million. Other income, net, was consistent with the first half of 2022.

Our effective tax rate for the first half of 2023 was 26 percent compared with 25 percent for the same period last year. The items impacting the effective tax rate are primarily related to (i) the provision for state income taxes, net of the federal benefit, of $15.0 million and (ii) the effect of foreign tax rates higher than statutory tax rates and other foreign items of $4.6 million.

For the first half of 2022, the items impacting the effective tax rate were primarily related to (i) the provision for state income taxes, net of the federal benefit, of $16.9 million and (ii) the effect of foreign tax rates higher than statutory tax rates of $3.4 million.

During the first half of 2023 and 2022, we recognized losses of $0.3 million and income of $5.0 million, respectively, on our investments in unconsolidated affiliates.

Piping Systems Segment

The following table compares summary operating results for the first half of 2023 and 2022 for the businesses comprising our Piping Systems segment:


	For the Quarter Ended				Percent Change		For the Six Months Ended				Percent Change
(In thousands)	July 1, 2023		June 25, 2022		2023 vs. 2022		July 1, 2023		June 25, 2022		2023 vs. 2022

Net sales	$	638,005	$	824,807	(22.6)	%	$	1,300,484	$	1,528,237	(14.9)	%
Operating income	151,142		211,579		(28.6)		314,996		372,067		(15.3)

The following are components of changes in net sales compared to the prior year:


	Quarter-to- Date		Year-to- Date
Net selling price in core product lines	(4.8)	%	(2.8)	%
Unit sales volume in core product lines	(14.8)		(10.4)


Other	(3.0)		(1.7)

	(22.6)	%	(14.9)	%

The decrease in net sales during the second quarter of 2023 was primarily attributable to (i) lower unit sales volume of $120.0 million in the segment’s core product lines, primarily copper tube and line sets, (ii) lower net selling prices in the segment’s core product lines of $38.9 million, and (iii) a decrease in sales of $21.7 million in the segment’s non-core product lines.

Net sales during the first half of 2023 decreased primarily as a result of (i) lower unit sales volume of $156.9 million in the segment’s core product lines, (ii) lower net selling prices in the segment’s core product lines of $42.5 million, and (iii) a decrease in sales of $26.0 million in the segment’s non-core product lines.

The following tables compare cost of goods sold and operating expenses as dollar amounts and as a percent of net sales for the first half of 2023 and 2022:


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Cost of goods sold	$	452,866	$	585,090	$	920,476	$	1,099,277
Depreciation and amortization	5,252		5,930		10,810		11,330
Selling, general, and administrative expense	28,745		22,208		54,202		45,563




Operating expenses	$	486,863	$	613,228	$	985,488	$	1,156,170


	For the Quarter Ended				For the Six Months Ended
	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Cost of goods sold	71.0	%	70.9	%	70.8	%	71.9	%
Depreciation and amortization	0.8		0.7		0.8		0.7
Selling, general, and administrative expense	4.5		2.6		4.2		3.0




Operating expenses	76.3	%	74.2	%	75.8	%	75.6	%

The decrease in cost of goods sold during the second quarter of 2023 was primarily due to the decrease in sales volume. Gross margin as a percentage of sales was 29.0 percent compared with 29.1 percent in the prior year quarter. Depreciation and

amortization decreased slightly in the second quarter of 2023 primarily as a result of long-lived assets becoming fully depreciated. Selling, general, and administrative expense increased for the second quarter of 2023 primarily as a result of (i) higher foreign currency transaction losses of $2.5 million, (ii) higher employment costs, including incentive compensation and healthcare, of $1.4 million, (iii) higher marketing and advertising costs of $0.7 million, (iv) higher legal and professional fees of $0.3 million, and (v) higher leases and rent of $0.3 million.

The decrease in cost of goods sold during the first half of 2023 was primarily due to the factors noted above regarding the change in net sales. Gross margin as a percentage of sales was 29.2 percent compared with 28.1 percent in the prior year. Depreciation and amortization decreased slightly in the first half of 2023 primarily as a result of depreciation and amortization of the long-lived assets becoming fully depreciated. Selling, general, and administrative expense increased for the first half of 2023 primarily as a result of (i) higher foreign currency transaction losses of $3.0 million, (ii) higher employment costs, including incentive compensation and healthcare, of $1.9 million, (iii) higher marketing and advertising costs of $1.2 million, (iv) higher product liability expense of $0.7 million, (v) higher legal and professional fees of $0.6 million, and (vi) higher lease and rent expense of $0.4 million.

Industrial Metals Segment

The following table compares summary operating results for the first half of 2023 and 2022 for the businesses comprising our Industrial Metals segment:


	For the Quarter Ended				Percent Change		For the Six Months Ended				Percent Change
(In thousands)	July 1, 2023		June 25, 2022		2023 vs. 2022		July 1, 2023		June 25, 2022		2023 vs. 2022

Net sales	$	146,266	$	179,175	(18.4)	%	$	311,500	$	353,487	(11.9)	%
Operating income	17,971		24,168		(25.6)		45,186		47,427		(4.7)

The following are components of changes in net sales compared to the prior year:


	Quarter-to- Date		Year-to- Date
Net selling price in core product lines	(7.7)	%	(5.4)	%
Unit sales volume in core product lines	(9.0)		(5.2)


Other	(1.7)		(1.3)

	(18.4)	%	(11.9)	%

The decrease in net sales during the second quarter of 2023 was primarily due to (i) lower unit sales volume of $15.8 million in the segment’s core product lines, primarily brass rod, and (ii) lower net selling prices of $13.5 million in the segment’s core product lines.

The decrease in net sales during the first half of 2023 was primarily due to (i) lower net selling prices of $18.6 million in the segment’s core product lines and (ii) lower unit sales volume of $17.8 million in the segment’s core product lines.

The following tables compare cost of goods sold and operating expenses as dollar amounts and as a percent of net sales for the first half of 2023 and 2022:


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Cost of goods sold	$	123,097	$	150,940	$	256,267	$	296,650
Depreciation and amortization	1,804		1,846		3,576		3,790
Selling, general, and administrative expense	3,394		2,221		6,471		5,620




Operating expenses	$	128,295	$	155,007	$	266,314	$	306,060


	For the Quarter Ended				For the Six Months Ended
	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Cost of goods sold	84.2	%	84.2	%	82.3	%	83.9	%
Depreciation and amortization	1.2		1.0		1.1		1.1
Selling, general, and administrative expense	2.3		1.3		2.1		1.6




Operating expenses	87.7	%	86.5	%	85.5	%	86.6	%

The decrease in cost of goods sold during the second quarter of 2023 was primarily due to the factors noted above regarding the change in net sales. Gross margin as a percentage of sales was 15.8 percent, unchanged from the prior year quarter. Depreciation and amortization was consistent with the second quarter of 2022. Selling, general, and administrative expense increased for the second quarter of 2023 primarily as a result of gains on the disposal of assets of $1.3 million recorded in the prior year quarter.

Climate Segment

The following table compares summary operating results for the first half of 2023 and 2022 for the businesses comprising our Climate segment:


	For the Quarter Ended				Percent Change		For the Six Months Ended				Percent Change
(In thousands)	July 1, 2023		June 25, 2022		2023 vs. 2022		July 1, 2023		June 25, 2022		2023 vs. 2022

Net sales	$	123,954	$	164,484	(24.6)	%	$	276,908	$	305,106	(9.2)	%
Operating income	57,067		50,747		12.5		111,055		87,447		27.0

Sales for the second quarter and first half of 2023 decreased primarily as a result of declining demand and a decrease in volume and price in certain product lines.

The following tables compare cost of goods sold and operating expenses as dollar amounts and as a percent of net sales for the first half of 2023 and 2022:


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Cost of goods sold	$	77,064	$	103,110	$	165,876	$	197,067
Depreciation and amortization	2,202		2,348		4,355		4,700
Selling, general and administrative expense	7,087		8,279		15,088		15,892
Gain on insurance settlement	(19,466)		—		(19,466)		—

Operating expenses	$	66,887	$	113,737	$	165,853	$	217,659


	For the Quarter Ended				For the Six Months Ended
	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Cost of goods sold	62.2	%	62.7	%	59.9	%	64.6	%
Depreciation and amortization	1.8		1.4		1.6		1.5
Selling, general and administrative expense	5.7		5.0		5.4		5.2
Gain on insurance settlement	(15.7)		—		(7.0)		—

Operating expenses	54.0	%	69.1	%	59.9	%	71.3	%

Gross margin as a percentage of sales was 37.8 percent compared with 37.3 percent in the prior year quarter. Depreciation and amortization was consistent with the second quarter of 2022. Selling, general, and administrative expense decreased for the second quarter of 2023 primarily due to lower agent commissions of $1.2 million. In addition, during the second quarter of 2023, we settled the insurance claim related to the August 2022 fire at our Bluffs, Illinois manufacturing operation and recognized a $19.5 million gain.

Cost of goods sold decreased during the first half of 2023 primarily due to factors noted above regarding the change in net sales. Gross margin as a percentage of sales was 40.1 percent compared with 35.4 percent in the prior year. Depreciation and amortization was consistent with the first half of 2022. Selling, general, and administrative expense decreased slightly for the first half of 2023 primarily as a result of lower agent commissions of $1.4 million. In addition, during the first half of 2023, we settled the insurance claim related to the August 2022 fire at our Bluffs, Illinois manufacturing operation and recognized a $19.5 million gain.

Liquidity and Capital Resources

The following table presents selected financial information for the first half of 2023 and 2022:


(In thousands)	2023		2022

Increase (decrease) in:
Cash, cash equivalents, and restricted cash	$	308,085	$	126,939
Short-term investments	(90,812)		—
Property, plant, and equipment, net	6,978		2,577
Total debt	(92)		368
Working capital, net of cash and current debt	10,390		166,145

Net cash provided by operating activities	250,830		204,534
Net cash provided by (used in) investing activities	107,996		(14,078)
Net cash used in financing activities	(55,566)		(61,283)

Cash Flows from Operating Activities

During the six months ended July 1, 2023, net cash provided by operating activities was primarily attributable to consolidated net income of $354.6 million. There were also increases due to non-cash adjustments primarily consisting of (i) depreciation and amortization of $21.3 million and (ii) stock-based compensation expense of $12.5 million, as well as (iii) non-capital related insurance proceeds of $9.9 million for the August 2022 fire in Bluffs, Illinois. These increases were largely offset by (i) an increase in accounts receivable of $77.7 million, (ii) the unrealized gain on short-term investments of $20.8 million, (iii) the gain related to the settlement of the insurance claim for the August 2022 fire in Bluffs, Illinois of $19.5 million, (iv) a decrease in current liabilities of $14.5 million, (v) an increase in inventories of $12.1 million, and (vi) an increase in other assets of $5.6 million.

During the six months ended June 25, 2022, net cash provided by operating activities was primarily attributable to (i) consolidated net income of $366.8 million, (ii) an increase in current liabilities of $28.9 million, (iii) depreciation and amortization of $22.3 million, and (iv) stock-based compensation expense of $5.2 million. These increases were largely offset by (i) an increase in accounts receivable of $146.4 million, (ii) an increase in inventories of $49.4 million, (iii) a gain of $6.8 million recognized on the sale of a building, (iv) an increase in other assets of $6.1 million, and (v) equity in earnings of unconsolidated affiliates of $5.0 million.

Cash Flows from Investing Activities

The major components of net cash provided by investing activities during the six months ended July 1, 2023 included (i) proceeds from the maturity of short-term investments of $217.9 million and (ii) insurance proceeds of $24.6 million for property and equipment related to the fire at our Bluffs, Illinois and the tornado at our Covington, Tennessee manufacturing operations. These sources were partially offset by (i) the purchase of short-term investments of $106.2 million and (ii) capital expenditures of $29.2 million.

The major component of net cash used in investing activities during the six months ended June 25, 2022 included capital expenditures of $23.2 million. This use was partially offset by proceeds from the sale of properties of $7.6 million.

Cash Flows from Financing Activities

For the six months ended July 1, 2023, net cash used in financing activities consisted primarily of (i) $33.4 million used for the payment of regular quarterly dividends to stockholders of the Company, (ii) $19.3 million used to repurchase common stock, and (ii) $2.6 million net cash used to settle stock-based awards.

For the six months ended June 25, 2022, net cash used in financing activities consisted primarily of (i) $33.5 million used to repurchase common stock and (ii) $28.0 million used for the payment of regular quarterly dividends to stockholders of the Company.

Liquidity and Outlook

We believe that cash provided by operations, funds available under the Credit Agreement, and cash on hand will be adequate to meet our liquidity needs, including working capital, capital expenditures, and debt payment obligations.

As of July 1, 2023, we had $898.4 million of cash and short-term investments on hand and $371.1 million available to be drawn under the Credit Agreement. Our current ratio was 5.4 to 1.

We have significant environmental remediation obligations which we expect to pay over future years. Cash used for environmental remediation activities was approximately $0.4 million during the first half of 2023. We expect to spend approximately $4.7 million over the next twelve months for ongoing environmental remediation activities.

The Company declared a quarterly cash dividend of 30.0 cents per common share during the first and second quarters of 2023 and 25.0 cents per common share during the first and second quarters of 2022, respectively. Payment of dividends in the future is dependent upon our financial condition, cash flows, capital requirements, earnings, and other factors.

Long-Term Debt

As of July 1, 2023, the Company’s total debt was $1.9 million or 0.1 percent of its total capitalization.

The Company’s Credit Agreement provides for an unsecured $400.0 million revolving credit facility, which matures March 31, 2026. There were no borrowings outstanding under the Credit Agreement as of July 1, 2023. The Credit Agreement backed approximately $28.9 million in letters of credit at the end of the second quarter of 2023.

Covenants contained in the Company’s financing obligations require, among other things, the maintenance of minimum levels of tangible net worth and the satisfaction of certain minimum financial ratios. As of July 1, 2023, the Company was in compliance with all of its debt covenants.

Share Repurchase Program

The Board of Directors has extended, until July 2023, the authorization to repurchase up to 20 million shares of the Company’s common stock through open market transactions or through privately negotiated transactions. We may cancel, suspend, or extend the time period for the repurchase of shares at any time. Any repurchases will be funded primarily through existing cash and cash from operations. We may hold any shares repurchased in treasury or use a portion of the repurchased shares for our stock-based compensation plans, as well as for other corporate purposes. From its initial authorization in 1999 through July 1, 2023, the Company has repurchased approximately 7.5 million shares under this authorization.

Contractual Cash Obligations

There have been no significant changes in our contractual cash obligations reported at December 31, 2022.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

The Company is exposed to market risk from changes in raw material and energy costs, interest rates, and foreign currency exchange rates. To reduce such risks, we may periodically use financial instruments. Hedging transactions are authorized and executed pursuant to policies and procedures. Further, we do not buy or sell financial instruments for trading purposes.

Cost and Availability of Raw Materials and Energy

Raw materials, primarily copper and brass, represent the largest component of the Company’s variable costs of production. The cost of these materials is subject to global market fluctuations caused by factors beyond our control. Significant increases in the cost of metal, to the extent not reflected in prices for our finished products, or the lack of availability could materially and adversely affect our business, results of operations, and financial condition.

The Company occasionally enters into future fixed-price arrangements with certain customers. We may utilize futures contracts to hedge risks associated with these forward fixed-price arrangements. We may also utilize futures contracts to manage price risk associated with inventory. Depending on the nature of the hedge, changes in the fair value of the futures contracts will either be offset against the change in fair value of the inventory through earnings or recognized as a component of accumulated other comprehensive income (AOCI) in equity and reflected in earnings upon the sale of inventory. Periodic value fluctuations

of the contracts generally offset the value fluctuations of the underlying fixed-price transactions or inventory. At July 1, 2023, we held open futures contracts to purchase approximately $24.7 million of copper over the next nine months related to fixed-price sales orders and to sell approximately $0.5 million of copper over the next 11 months related to copper inventory.

We may enter into futures contracts or forward fixed-price arrangements with certain vendors to manage price risk associated with natural gas purchases. The effective portion of gains and losses with respect to these positions are deferred in equity as a component of AOCI and reflected in earnings upon consumption of natural gas. Periodic value fluctuations of the futures contracts generally offset the value fluctuations of the underlying natural gas prices. As of July 1, 2023, we held no open futures contracts to purchase natural gas.

Interest Rates

At July 1, 2023, we had no variable-rate debt outstanding. At this borrowing level, a hypothetical 10 percent increase in interest rates would have had an insignificant unfavorable impact on our pretax earnings and cash flows. The primary interest rate exposure on variable-rate debt is based on the Secured Overnight Financing Rate (SOFR).

Foreign Currency Exchange Rates

Foreign currency exposures arising from transactions include firm commitments and anticipated transactions denominated in a currency other than an entity’s functional currency. The Company and its subsidiaries generally enter into transactions denominated in their respective functional currencies. We may utilize certain futures or forward contracts with financial institutions to hedge foreign currency transactional exposures. Gains and losses with respect to these positions are deferred in equity as a component of AOCI and reflected in earnings upon collection of receivables or payment of commitments. At July 1, 2023, we had open forward contracts with a financial institution to sell approximately 4.3 million euros, 32.6 million Swedish kronor, and 8.5 million Norwegian kroner through October 2023.

The Company’s primary foreign currency exposure arises from foreign-denominated revenues and profits and their translation into U.S. dollars. The primary currencies to which we are exposed include the Canadian dollar, the British pound sterling, the Mexican peso, the South Korean won, and the Bahraini dinar. The Company generally views its investments in foreign subsidiaries with a functional currency other than the U.S. dollar as long-term. As a result, we generally do not hedge these net investments.

Cautionary Statement Regarding Forward Looking Information

This Quarterly Report contains various forward-looking statements and includes assumptions concerning the Company’s operations, future results, and prospects. These forward-looking statements are based on current expectations and are subject to risk and uncertainties, and may be influenced by factors that could cause actual outcomes and results to be materially different from those predicted. The forward-looking statements reflect knowledge and information available as of the date of preparation of the Quarterly Report, and the Company undertakes no obligation to update these forward-looking statements. We identify the forward-looking statements by using the words “anticipates,” “believes,” “expects,” “intends” or similar expressions in such statements.

In connection with the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995, the Company provides the following cautionary statement identifying important economic, political, and technological factors, among others, which could cause actual results or events to differ materially from those set forth in or implied by the forward-looking statements and related assumptions. In addition to those factors discussed under “Risk Factors” in the Annual Report on Form 10-K for the year ended December 31, 2022, such factors include: (i) the current and projected future business environment, including interest rates capital and consumer spending, and the impact of the COVID-19 pandemic; (ii) the domestic housing and commercial construction industry environment; (iii) availability and price fluctuations in commodities (including copper, natural gas, and other raw materials, including crude oil that indirectly affects plastic resins); (iv) competitive factors and competitor responses to the Company’s initiatives; (v) stability of government laws and regulations, including taxes; (vi) availability of financing; and (vii) continuation of the environment to make acquisitions, domestic and foreign, including regulatory requirements and market values of candidates.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

The Company maintains disclosure controls and procedures designed to ensure information required to be disclosed in Company reports filed under the Securities Exchange Act of 1934, as amended (the Exchange Act), is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures are designed to provide reasonable assurance that information required to be disclosed in Company reports filed under the Exchange Act is accumulated and communicated to management, including the Company’s Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

The Company’s management, with the participation of the Company’s Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures pursuant to Rule 13a-15(e) of the Exchange Act as of July 1, 2023. Based on that evaluation, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures are effective as of July 1, 2023 to ensure that information required to be disclosed in Company reports filed under the Exchange Act is (i) recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms and (ii) accumulated and communicated to management, including the Company’s principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in the Company’s internal control over financial reporting during the Company’s fiscal quarter ending July 1, 2023, that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

General

The Company is involved in certain litigation as a result of claims that arose in the ordinary course of business. Additionally, the Company may realize the benefit of certain legal claims and litigation in the future; these gain contingencies are not recognized in the Condensed Consolidated Financial Statements. For a description of material pending legal proceedings, see “Note 9 - Commitments and Contingencies” in the Notes to the Condensed Consolidated Financial Statements, which is incorporated herein by reference.

Item 1A. Risk Factors

The Company is exposed to risk as it operates its businesses. To provide a framework to understand the operating environment of the Company, we have provided a brief explanation of the more significant risks associated with our businesses in our 2022 Annual Report on Form 10-K. There have been no material changes in risk factors that were previously disclosed in our 2022 Annual Report on Form 10-K. Additionally, the operating results of the Company’s unconsolidated affiliates may be adversely affected by unfavorable economic and market conditions.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchases of Equity Securities

The Company’s Board of Directors has extended, until July 2023, the authorization to repurchase up to 20 million shares of the Company’s common stock through open market transactions or through privately negotiated transactions. The Company may cancel, suspend, or extend the time period for the repurchase of shares at any time. Any repurchases will be funded primarily through existing cash and cash from operations. The Company may hold any shares repurchased in treasury or use a portion of the repurchased shares for its stock-based compensation plans, as well as for other corporate purposes. From its initial authorization in 1999 through July 1, 2023, the Company had repurchased approximately 7.5 million shares under this authorization. Below is a summary of the Company’s stock repurchases for the period ended July 1, 2023.


	(a) Total Number of Shares Purchased (1)	(b) Average Price Paid per Share		(c) Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	(d) Maximum Number of Shares That May Yet Be Purchased Under the Plans or Programs (2)


April 2 - April 29, 2023	1,641	$	63.80	—	12,759,795
April 30 - May 27, 2023	269,263	$	74.95	257,891	12,501,904
May 28 - July 1, 2023	185	$	83.57	—	12,501,904
Total	271,089			257,891

(1) Includes shares tendered to the Company by holders of stock-based awards in payment of the purchase price and/or withholding taxes upon exercise and/or vesting. Also includes shares resulting from restricted stock forfeitures at the average cost of treasury stock.

(2) Shares available to be purchased under the Company’s 20 million share repurchase authorization until July 2023. The extension of the authorization was announced on October 19, 2022.

Item 5. Other Information

On May 8, 2023, Steffen Sigloch, Chief Manufacturing Officer, entered into a 10b5-1 sales plan (the Sales Plan) intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act. The Sales Plan provides for the sale of up to an aggregate of 83,703 shares of the Company’s common stock beneficially owned by Mr. Sigloch during the term of the Sales Plan and will be in effect until the earlier of (1) February 7, 2025 and (2) the date on which an aggregate of 83,703 shares of the Company’s common stock have been sold under the Sales Plan.

Item 6. Exhibits


31.1			Certification of Chief Executive Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended.

31.2			Certification of Chief Financial Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended.

32.1			Certification of Chief Executive Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

32.2			Certification of Chief Financial Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101.CAL			Inline XBRL Taxonomy Extension Calculation Linkbase

101.DEF			Inline XBRL Taxonomy Extension Definition Linkbase

101.INS			Inline XBRL Instance Document

101.LAB			Inline XBRL Taxonomy Extension Label Linkbase

101.PRE			Inline XBRL Presentation Linkbase Document

101.SCH			Inline XBRL Taxonomy Extension Schema

104			Cover Page Interactive Data File (embedded within the Inline XBRL document and included in exhibit 101)

Items 3 and 4 are not applicable and have been omitted.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.


			MUELLER INDUSTRIES, INC.


			/s/ Jeffrey A. Martin
			Jeffrey A. Martin
July 26, 2023			Chief Financial Officer and Treasurer
Date			(Principal Financial and Accounting Officer)


			/s/ Anthony J. Steinriede
July 26, 2023			Anthony J. Steinriede
Date			Vice President – Corporate Controller

Exhibit 31.1

CERTIFICATION

I, Gregory L. Christopher, certify that:


1.	I have reviewed this quarterly report on Form 10-Q of Mueller Industries, Inc.;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.	The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)), for the registrant and have:

	a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

	b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

	c)	Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

	d)	Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.	The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

	a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

	b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.


Date: July 26, 2023
			/s/ Gregory L. Christopher
			Gregory L. Christopher
			Chief Executive Officer

Exhibit 31.2

CERTIFICATION

I, Jeffrey A. Martin, certify that:


1.	I have reviewed this quarterly report on Form 10-Q of Mueller Industries, Inc.;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.	The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)), for the registrant and have:

	a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

	b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

	c)	Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

	d)	Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.	The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

	a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

	b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.


Date: July 26, 2023
			/s/ Jeffrey A. Martin
			Jeffrey A. Martin
			Chief Financial Officer

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Mueller Industries, Inc. (the "Company") on Form 10-Q for the period ending July 1, 2023 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Gregory L. Christopher, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:


(1)			The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)			The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.



/s/ GREGORY L. CHRISTOPHER
Gregory L. Christopher
Chief Executive Officer
July 26, 2023

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Mueller Industries, Inc. (the "Company") on Form 10-Q for the period ending July 1, 2023 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Jeffrey A. Martin, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:


(1)			The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)			The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.



/s/ JEFFREY A. MARTIN
Jeffrey A. Martin
Chief Financial Officer
July 26, 2023

Cover - shares	6 Months Ended
Cover - shares	Jul. 01, 2023	Jul. 21, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jul. 01, 2023
Document Transition Report	false
Entity File Number	1-6770
Entity Registrant Name	MUELLER INDUSTRIES INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	25-0790410
Entity Address, Address Line One	150 Schilling Boulevard
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Collierville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	38017
City Area Code	901
Local Phone Number	753-3200
Title of 12(b) Security	Common Stock
Trading Symbol	MLI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		56,778,790
Entity Central Index Key	0000089439
Current Fiscal Year End Date	--12-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Income Statement [Abstract]
Net sales	$ 896,984	$ 1,150,042	$ 1,868,176	$ 2,160,044
Cost of goods sold	639,272	820,914	1,318,070	1,565,425
Depreciation and amortization	10,416	11,302	21,073	22,143
Selling, general, and administrative expense	56,062	48,956	108,693	96,412
Gain on sale of assets	0	0	0	(5,507)
Gain on insurance settlement	(19,466)	0	(19,466)	0
Operating income	210,700	268,870	439,806	481,571
Interest expense	(135)	(147)	(278)	(305)
Interest income	7,732	103	13,967	263
Unrealized gain on short-term investments	20,820	0	20,820	0
Other income, net	1,841	2,100	4,077	2,720
Income before income taxes	240,958	270,926	478,392	484,249
Income tax expense	(62,122)	(68,290)	(123,479)	(122,489)
Income (loss) from unconsolidated affiliates, net of foreign tax	715	4,888	(269)	5,012
Consolidated net income	179,551	207,524	354,644	366,772
Net income attributable to noncontrolling interests	(1,840)	(972)	(3,694)	(1,904)
Net income attributable to Mueller Industries, Inc.	$ 177,711	$ 206,552	$ 350,950	$ 364,868
Weighted average shares for basic earnings per share (in shares)	55,660	55,787	55,677	55,943
Effect of dilutive stock-based awards (in shares)	1,340	741	1,023	776
Adjusted weighted average shares for diluted earnings per share (in shares)	57,000	56,528	56,700	56,719
Basic earnings per share (in dollars per share)	$ 3.19	$ 3.70	$ 6.30	$ 6.52
Diluted earnings per share (in dollars per share)	3.12	3.65	6.19	6.43
Dividends per share (in dollars per share)	$ 0.30	$ 0.25	$ 0.60	$ 0.50

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 179,551	$ 207,524	$ 354,644	$ 366,772
Other comprehensive income (loss), net of tax:
Foreign currency translation	7,725	(17,120)	17,976	(15,907)
Net change with respect to derivative instruments and hedging activities, net of tax of $775, $3,450, $503, and $2,846	(2,679)	(11,886)	(1,725)	(9,795)
Net change in pension and postretirement obligation adjustments, net of tax of $1, $31, $12, and $(103)	9	(299)	1	121
Attributable to unconsolidated affiliates, net of tax of $(103), $(656), $(476), and $(1,280)	353	2,261	1,638	4,409
Total other comprehensive income (loss), net	5,408	(27,044)	17,890	(21,172)
Consolidated comprehensive income	184,959	180,480	372,534	345,600
Comprehensive (income) loss attributable to noncontrolling interests	(1,546)	584	(3,658)	(315)
Comprehensive income attributable to Mueller Industries, Inc.	$ 183,413	$ 181,064	$ 368,876	$ 345,285

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Statement of Comprehensive Income [Abstract]
Net change with respect to derivative instruments and hedging activities, tax (expense) benefit	$ 775	$ 3,450	$ 503	$ 2,846
Net actuarial loss on pension and postretirement obligations, tax benefit (expense)	(1)	(31)	(12)	103
Attributable to unconsolidated affiliates, tax benefit (expense)	$ 103	$ (656)	$ (476)	$ (1,280)

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 771,317	$ 461,018
Short-term investments	127,051	217,863
Accounts receivable, less allowance for doubtful accounts of $2,905 in 2023 and $2,687 in 2022	459,467	380,352
Inventories	465,729	448,919
Other current assets	28,172	26,501
Total current assets	1,851,736	1,534,653
Property, plant, and equipment, net	386,928	379,950
Operating lease right-of-use assets	31,164	22,892
Goodwill, net	158,769	157,588
Intangible assets, net	52,926	54,785
Investments in unconsolidated affiliates	73,412	72,364
Other assets	21,485	20,167
Total assets	2,576,420	2,242,399
Current liabilities:
Current portion of debt	670	811
Accounts payable	155,096	128,000
Accrued wages and other employee costs	45,148	61,915
Current portion of operating lease liabilities	6,951	4,942
Other current liabilities	136,683	152,627
Total current liabilities	344,548	348,295
Long-term debt, less current portion	1,267	1,218
Pension liabilities	2,929	4,078
Postretirement benefits other than pensions	9,237	8,977
Environmental reserves	15,729	16,380
Deferred income taxes	18,821	16,258
Noncurrent operating lease liabilities	23,596	16,880
Other noncurrent liabilities	17,355	16,349
Total liabilities	433,482	428,435
Mueller Industries, Inc. stockholders' equity:
Preferred stock - $1.00 par value; shares authorized 5,000,000; none outstanding	0	0
Common stock - $.01 par value; shares authorized 100,000,000; issued 80,183,004; outstanding 56,777,485 in 2023 and 57,001,617 in 2022	802	802
Additional paid-in capital	309,705	297,270
Retained earnings	2,376,618	2,059,796
Accumulated other comprehensive loss	(46,249)	(64,175)
Treasury common stock, at cost	(524,646)	(502,779)
Total Mueller Industries, Inc. stockholders' equity	2,116,230	1,790,914
Noncontrolling interests	26,708	23,050
Total equity	2,142,938	1,813,964
Commitments and contingencies	0	0
Total liabilities and equity	$ 2,576,420	$ 2,242,399

CONDENSED CONSOLIDATED BALANCE SHEETS - (Parenthetical) - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022
Current assets:
Allowance for doubtful accounts	$ 2,905	$ 2,687
Mueller Industries, Inc. stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	80,183,004	80,183,004
Common stock, shares outstanding (in shares)	56,777,485	57,001,617

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022
Cash flows from operating activities
Consolidated net income	$ 354,644	$ 366,772
Reconciliation of consolidated net income to net cash provided by operating activities:
Depreciation and amortization	21,252	22,322
Stock-based compensation expense	12,459	5,171
Provision for doubtful accounts receivable	(80)	151
Loss (income) from unconsolidated affiliates	269	(5,012)
Insurance proceeds - noncapital related	9,854	0
Gain on disposals of properties	(141)	(6,800)
Unrealized gain on short-term investments	20,820	0
Gain on insurance settlement	(19,466)	0
Deferred income tax expense (benefit)	2,406	(373)
Changes in assets and liabilities:
Receivables	(77,701)	(146,438)
Inventories	(12,149)	(49,354)
Other assets	(5,571)	(6,095)
Current liabilities	(14,460)	28,906
Other liabilities	(976)	(4,283)
Other, net	1,310	(433)
Net cash provided by operating activities	250,830	204,534
Cash flows from investing activities
Capital expenditures	(29,221)	(23,248)
Insurance proceeds - capital related	24,646	0
Purchase of short-term investments	(106,231)	0
Proceeds from the maturity of short-term investments	217,863	0
Proceeds from sales of assets	142	7,561
Dividends from unconsolidated affiliates	797	1,609
Net cash provided by (used in) investing activities	107,996	(14,078)
Cash flows from financing activities
Dividends paid to stockholders of Mueller Industries, Inc.	(33,402)	(27,968)
Repurchase of common stock	(19,303)	(33,469)
Repayments of debt	(130)	(111)
(Repayment) issuance of debt by consolidated joint ventures, net	(143)	360
Net cash used to settle stock-based awards	(2,588)	(95)
Net cash used in financing activities	(55,566)	(61,283)
Effect of exchange rate changes on cash	4,825	(2,234)
Increase in cash, cash equivalents, and restricted cash	308,085	126,939
Cash, cash equivalents, and restricted cash at the beginning of the period	465,296	90,376
Cash, cash equivalents, and restricted cash at the end of the period	$ 773,381	$ 217,315

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated other comprehensive loss	Treasury Stock	Noncontrolling Interest
Balance at beginning of period at Dec. 25, 2021		$ 802	$ 286,208	$ 1,458,489	$ (53,347)	$ (470,034)	$ 34,845
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition (issuance) of shares under incentive stock option plans			293
Stock-based compensation expense			5,171
Issuance of restricted stock			(444)			444
Net income attributable to Mueller Industries, Inc.	$ 364,868			364,868
Dividends paid or payable to stockholders of Mueller Industries, Inc.				(28,546)
Total other comprehensive income (loss) attributable to Mueller Industries, Inc.	(21,172)				(19,583)
(Acquisition) issuance of shares under incentive stock option plans						(389)
Repurchase of common stock						(33,469)
Net income attributable to noncontrolling interests	(1,904)						1,904
Foreign currency translation	(15,907)						(1,589)
Balance at end of period at Jun. 25, 2022		802	291,228	1,794,811	(72,930)	(503,448)	35,160
Balance at beginning of period at Mar. 26, 2022		802	288,802	1,602,496	(47,442)	(474,258)	35,744
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition (issuance) of shares under incentive stock option plans			272
Stock-based compensation expense			2,598
Issuance of restricted stock			(444)			444
Net income attributable to Mueller Industries, Inc.	206,552			206,552
Dividends paid or payable to stockholders of Mueller Industries, Inc.				(14,237)
Total other comprehensive income (loss) attributable to Mueller Industries, Inc.	(27,044)				(25,488)
(Acquisition) issuance of shares under incentive stock option plans						(137)
Repurchase of common stock						(29,497)
Net income attributable to noncontrolling interests	(972)						972
Foreign currency translation	(17,120)						(1,556)
Balance at end of period at Jun. 25, 2022		802	291,228	1,794,811	(72,930)	(503,448)	35,160
Balance at beginning of period at Dec. 31, 2022	1,813,964	802	297,270	2,059,796	(64,175)	(502,779)	23,050
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition (issuance) of shares under incentive stock option plans			434
Stock-based compensation expense			12,459
Issuance of restricted stock			(458)			458
Net income attributable to Mueller Industries, Inc.	350,950			350,950
Dividends paid or payable to stockholders of Mueller Industries, Inc.				(34,128)
Total other comprehensive income (loss) attributable to Mueller Industries, Inc.	17,890				17,926
(Acquisition) issuance of shares under incentive stock option plans						(3,022)
Repurchase of common stock						(19,303)
Net income attributable to noncontrolling interests	(3,694)						3,694
Foreign currency translation	17,976						(36)
Balance at end of period at Jul. 01, 2023	2,142,938	802	309,705	2,376,618	(46,249)	(524,646)	26,708
Balance at beginning of period at Apr. 01, 2023		802	303,133	2,215,939	(51,951)	(505,616)	25,162
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition (issuance) of shares under incentive stock option plans			208
Stock-based compensation expense			6,822
Issuance of restricted stock			(458)			458
Net income attributable to Mueller Industries, Inc.	177,711			177,711
Dividends paid or payable to stockholders of Mueller Industries, Inc.				(17,032)
Total other comprehensive income (loss) attributable to Mueller Industries, Inc.	5,408				5,702
(Acquisition) issuance of shares under incentive stock option plans						(185)
Repurchase of common stock						(19,303)
Net income attributable to noncontrolling interests	(1,840)						1,840
Foreign currency translation	7,725						(294)
Balance at end of period at Jul. 01, 2023	$ 2,142,938	$ 802	$ 309,705	$ 2,376,618	$ (46,249)	$ (524,646)	$ 26,708

Recent Accounting Standards	6 Months Ended
Recent Accounting Standards	Jul. 01, 2023
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Standards	Recent Accounting Standards Adopted In October 2021, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2021-08, Business Combinations (Topic 805): An Amendment of the FASB Accounting Standards Codification. The new guidance was issued to improve accounting for acquired revenue contracts with customers in a business combination by addressing diversity in practice and inconsistency related to the (i) recognition of an acquired contract liability, and (ii) payment terms and their effect on subsequent revenue recognized by the acquirer. The ASU is effective for fiscal years beginning after December 15, 2022 for public entities. The updated guidance requires prospective adoption, and early adoption is permitted. The Company adopted the ASU during the first quarter of 2023. The adoption of the ASU did not have a material impact on the Company’s Condensed Consolidated Financial Statements. Issued In June 2022, the FASB issued ASU No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. The new guidance was issued to clarify existing guidance measuring the fair value of an equity security subject to contractual restrictions that prohibit the sale of an equity security and introduce new disclosure requirements for applicable equity securities. The ASU is effective for fiscal years beginning after December 15, 2023 for public entities. The updated guidance requires prospective adoption, and early adoption is permitted. The Company does not expect the adoption of the ASU to have a material impact on its Condensed Consolidated Financial Statements.

Earnings per Common Share	6 Months Ended
Earnings per Common Share	Jul. 01, 2023
Earnings Per Share [Abstract]
Earnings per Common Share	Earnings per Common ShareBasic per share amounts have been computed based on the average number of common shares outstanding. Diluted per share amounts reflect the increase in average common shares outstanding that would result from the assumed exercise of outstanding stock options and vesting of restricted stock awards, computed using the treasury stock method. There were no stock-based awards excluded from the computation of diluted earnings per share for the quarter ended July 1, 2023 because they were antidilutive. Approximately eight thousand stock-based awards were excluded from the computation of diluted earnings per share for the quarter ended June 25, 2022 because they were antidilutive.

Segment Information

6 Months Ended

Jul. 01, 2023

Segment Reporting [Abstract]

Segment Information

Each of the Company’s reportable segments is composed of certain operating segments that are aggregated primarily by the nature of products offered as follows:

Piping Systems

Industrial Metals

Climate

Summarized segment information is as follows:


	For the Quarter Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	638,005	$	146,266	$	123,954	$	(11,241)	$	896,984

Cost of goods sold	452,866		123,097		77,064		(13,755)		639,272
Depreciation and amortization	5,252		1,804		2,202		1,158		10,416
Selling, general, and administrative expense	28,745		3,394		7,087		16,836		56,062




Gain on insurance settlement	—		—		(19,466)		—		(19,466)

Operating income	151,142		17,971		57,067		(15,480)		210,700

Interest expense									(135)
Interest income									7,732
Unrealized gain on short-term investments									20,820
Other income, net									1,841

Income before income taxes									$	240,958

Segment information (continued):


	For the Quarter Ended June 25, 2022
(In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	824,807	$	179,175	$	164,484	$	(18,424)	$	1,150,042

Cost of goods sold	585,090		150,940		103,110		(18,226)		820,914
Depreciation and amortization	5,930		1,846		2,348		1,178		11,302
Selling, general, and administrative expense	22,208		2,221		8,279		16,248		48,956





Operating income	211,579		24,168		50,747		(17,624)		268,870

Interest expense									(147)
Interest income									103
Other income, net									2,100

Income before income taxes									$	270,926


	For the Six Months Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	1,300,484	$	311,500	$	276,908	$	(20,716)	$	1,868,176

Cost of goods sold	920,476		256,267		165,876		(24,549)		1,318,070
Depreciation and amortization	10,810		3,576		4,355		2,332		21,073
Selling, general, and administrative expense	54,202		6,471		15,088		32,932		108,693




Gain on insurance settlement	—		—		(19,466)		—		(19,466)

Operating income	314,996		45,186		111,055		(31,431)		439,806

Interest expense									(278)
Interest income									13,967
Unrealized gain on short-term investments									20,820
Other income, net									4,077

Income before income taxes									$	478,392

Segment information (continued):


	For the Six Months Ended June 25, 2022
( In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	1,528,237	$	353,487	$	305,106	$	(26,786)	$	2,160,044

Cost of goods sold	1,099,277		296,650		197,067		(27,569)		1,565,425
Depreciation and amortization	11,330		3,790		4,700		2,323		22,143
Selling, general, and administrative expense	45,563		5,620		15,892		29,337		96,412
Gain on sale of assets	—		—		—		(5,507)		(5,507)




Operating income	372,067		47,427		87,447		(25,370)		481,571

Interest expense									(305)
Interest income									263
Other income, net									2,720

Income before income taxes									$	484,249

The following table presents total assets attributable to each segment:


(In thousands)	July 1, 2023		December 31, 2022

Segment assets:
Piping Systems	$	1,218,810	$	1,088,940
Industrial Metals	165,534		160,702
Climate	263,666		279,940
General Corporate	928,410		712,817

	$	2,576,420	$	2,242,399

The following tables represent a disaggregation of revenue from contracts with customers, along with the reportable segment for each category:


	For the Quarter Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Total

Tube and fittings	$	518,712	$	—	$	—	$	518,712
Brass rod and forgings	—		113,563		—		113,563
OEM components, tube & assemblies	—		21,073		33,007		54,080
Valves and plumbing specialties	119,293		—		—		119,293
Flex duct and other HVAC components	—		—		90,947		90,947
Other	—		11,630		—		11,630

	638,005		146,266		123,954		908,225

Intersegment sales							(11,241)

Net sales							$	896,984


	For the Quarter Ended June 25, 2022
(In thousands)	Piping Systems		Industrial Metals		Climate		Total

Tube and fittings	$	674,579	$	—	$	—	$	674,579
Brass rod and forgings	—		142,788		—		142,788
OEM components, tube & assemblies	—		20,254		32,526		52,780
Valves and plumbing specialties	150,228		—		—		150,228
Flex duct and other HVAC components	—		—		131,958		131,958
Other	—		16,133		—		16,133

	824,807		179,175		164,484		1,168,466

Intersegment sales							(18,424)

Net sales							$	1,150,042

Disaggregation of revenue from contracts with customers (continued):


	For the Six Months Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Total

Tube and fittings	$	1,062,940	$	—	$	—	$	1,062,940
Brass rod and forgings	—		243,903		—		243,903
OEM components, tube & assemblies	—		43,582		66,409		109,991
Valves and plumbing specialties	237,544		—		—		237,544
Flex duct and other HVAC components	—		—		210,499		210,499
Other	—		24,015		—		24,015

	1,300,484		311,500		276,908		1,888,892

Intersegment sales							(20,716)

Net sales							$	1,868,176


	For the Six Months Ended June 25, 2022
(In thousands)	Piping Systems	Industrial Metals	Climate	Total

Tube and fittings	1,246,089	—	—	1,246,089
Brass rod and forgings	—	279,321	—	279,321
OEM components, tube & assemblies	—	40,350	61,618	101,968
Valves and plumbing specialties	282,148	—	—	282,148
Flex duct and other HVAC components	—	—	243,488	243,488
Other	—	33,816	—	33,816

	1,528,237	353,487	305,106	2,186,830

Intersegment sales				(26,786)

Net sales				$	2,160,044

Cash, Cash Equivalents, and Restricted Cash

6 Months Ended

Jul. 01, 2023

Cash and Cash Equivalents [Abstract]

Cash, Cash Equivalents, and Restricted Cash


(In thousands)	July 1, 2023		December 31, 2022

Cash & cash equivalents	$	771,317	$	461,018
Restricted cash included within other current assets	1,962		4,176
Restricted cash included within other assets	102		102

Total cash, cash equivalents, and restricted cash	$	773,381	$	465,296

Inventories

6 Months Ended

Jul. 01, 2023

Inventory Disclosure [Abstract]

Inventories


(In thousands)	July 1, 2023		December 31, 2022

Raw materials and supplies	$	158,302	$	133,189
Work-in-process	79,601		64,177
Finished goods	239,635		265,842
Valuation reserves	(11,809)		(14,289)

Inventories	$	465,729	$	448,919

Financial Instruments

6 Months Ended

Jul. 01, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments

Short-Term Investments

Derivative Instruments and Hedging Activities

Commodity Futures Contracts


	Asset Derivatives					Liability Derivatives
		Fair Value					Fair Value
(In thousands)	Balance Sheet Location	July 1, 2023		December 31, 2022		Balance Sheet Location	July 1, 2023		December 31, 2022

Commodity contracts - gains	Other current assets	$	74	$	3,746	Other current liabilities	$	305	$	—
Commodity contracts - losses	Other current assets	(9)		(1,483)		Other current liabilities	(814)		—

Total derivatives (1)		$	65	$	2,263		$	(509)	$	—

(1) Does not include the impact of cash collateral provided to counterparties.

The following tables summarize the effects of derivative instruments on the Company’s Condensed Consolidated Statements of Income:

For the Quarter Ended

For the Six Months Ended

(In thousands)

Location

July 1, 2023

June 25, 2022

July 1, 2023

June 25, 2022

Undesignated derivatives:

Gain (loss) on commodity contracts (nonqualifying)

Cost of goods sold

427

12,457

(2,057)

15,882

The following tables summarize amounts recognized in and reclassified from AOCI during the period:


	For the Quarter Ended July 1, 2023
(In thousands)	(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	(1,961)	Cost of goods sold	$	(742)
Other	24		Other	—

Total	$	(1,937)	Total	$	(742)

Amounts recognized in and reclassified from AOCI (continued):


	For the Quarter Ended June 25, 2022
(In thousands)	(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	(11,107)	Cost of goods sold	$	(792)
Other	13		Other	—

Total	$	(11,094)	Total	$	(792)


	For the Six Months Ended July 1, 2023
(In thousands)	Gain (Loss) Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	1,008	Cost of goods sold	$	(2,731)
Other	(2)		Other	—

Total	$	1,006	Total	$	(2,731)


	For the Six Months Ended June 25, 2022
(In thousands)	(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	(7,326)	Cost of goods sold	$	(2,514)
Other	45		Other	—

Total	$	(7,281)	Total	$	(2,514)

Long-Term Debt

Investments in Unconsolidated Affiliates

6 Months Ended

Jul. 01, 2023

Equity Method Investments and Joint Ventures [Abstract]

Investments in Unconsolidated Affiliates

Tecumseh


(In thousands)	July 1, 2023		December 31, 2022

Current assets	$	230,018	$	248,808
Noncurrent assets	94,763		77,395
Current liabilities	182,462		190,746
Noncurrent liabilities	51,391		43,003


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Net sales	$	111,741	$	126,337	$	225,159	$	252,304
Gross profit	22,822		26,257		42,638		45,032
Net (loss) income	(1,244)		7,375		(5,961)		6,169

Retail Distribution

Benefit Plans

6 Months Ended

Jul. 01, 2023

Retirement Benefits [Abstract]

Benefit Plans


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Pension benefits:

Interest cost	$	595	$	393	$	1,189	$	787
Expected return on plan assets	(842)		(967)		(1,683)		(1,934)
Amortization of net loss	—		243		—		487

Net periodic benefit income	$	(247)	$	(331)	$	(494)	$	(660)

Other benefits:
Service cost	$	50	$	72	$	101	$	144
Interest cost	128		103		256		206
Amortization of prior service cost (credit)	—		(79)		(1)		(197)
Amortization of net gain	(99)		(60)		(196)		(118)
Curtailment gain	—		$	(1,756)	—		$	(1,756)

Net periodic benefit cost (income)	$	79	$	(1,720)	$	160	$	(1,721)

The components of net periodic benefit cost (income) other than the service cost component are included in other income, net in the Condensed Consolidated Statements of Income.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jul. 01, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company is involved in certain litigation as a result of claims that arose in the ordinary course of business, which management believes will not have a material adverse effect on the Company’s financial position, results of operations, or cash flows. The Company may also realize the benefit of certain legal claims and litigation in the future; these gain contingencies are not recognized in the Condensed Consolidated Financial Statements. Environmental Non-operating Properties Southeast Kansas Sites The Kansas Department of Health and Environment (KDHE) has contacted the Company regarding environmental contamination at three former smelter sites in Kansas (Altoona, East La Harpe, and Lanyon). The Company is not a successor to the companies that operated these smelter sites, but is exploring possible settlement with KDHE and other potentially responsible parties (PRP) in order to avoid litigation. In February 2022, the Company reached a settlement with another PRP relating to these three sites. Under the terms of that agreement, the Company paid $5.6 million, which was previously reserved, in exchange for the other PRP’s agreement to conduct or fund any required remediation within the geographic boundaries of the three sites (namely, the parcel(s) on which the former smelters were located), plus coverage of certain off-site areas (namely, contamination that migrated by surface water runoff or air emissions from the Altoona or East La Harpe site, and smelter materials located within 50 feet of the geographic boundary of each site). The settlement does not cover certain matters, including potential liability related to the remediation of the town of Iola which is not estimable at this time. The other PRP will also provide an indemnity that would cover third-party cleanup claims for those sites, subject to a time limit and a cap. Altoona. Another PRP conducted a site investigation of the Altoona site under a consent decree with KDHE and submitted a removal site evaluation report recommending a remedy. The remedial design plan, which covers both on-site and certain off-site cleanup costs, was approved by the KDHE in 2016. Construction of the remedy was completed in 2018. Under the terms of the settlement with the other PRP, the Company expects the operations and maintenance costs for this remedy to be paid for entirely by the other PRP. East La Harpe. At the East La Harpe site, the Company and two other PRPs conducted a site study evaluation under KDHE supervision and prepared a site cleanup plan approved by KDHE. In December 2018, KDHE provided a draft agreement which contemplates the use of funds KDHE obtained from two other parties (Peabody Energy and Blue Tee) to fund part of the remediation, and removes Blue Tee from the PRPs’ agreement with KDHE. Pursuant to the terms of the settlement with the other PRP noted above, the Company expects the remediation to be conducted and paid for entirely by the other PRP, and for the other PRP to negotiate and enter into an agreement with KDHE. Lanyon. With respect to the Lanyon Site, in 2016, the Company received a general notice letter from the United States Environmental Protection Agency (EPA) asserting that the Company is a PRP, which the Company has denied. EPA issued an interim record of decision in 2017 and has been remediating properties at the site. According to EPA, 1,371 properties in total will be remediated, and the work will continue into 2023. Shasta Area Mine Sites Mining Remedial Recovery Company (MRRC), a wholly owned subsidiary, owns certain inactive mines in Shasta County, California. MRRC has continued a program, begun in the late 1980s, of implementing various remedial measures, including sealing mine portals with concrete plugs in portals that were discharging water. The sealing program achieved significant reductions in the metal load in discharges from these adits; however, additional reductions are required pursuant to an order issued by the California Regional Water Quality Control Board (QCB). In response to a 1996 QCB Order, MRRC completed a feasibility study in 1997 describing measures designed to mitigate the effects of acid rock drainage. In December 1998, the QCB modified the 1996 order extending MRRC’s time to comply with water quality standards. In September 2002, the QCB adopted a new order requiring MRRC to adopt Best Management Practices (BMP) to control discharges of acid mine drainage, and again extended the time to comply with water quality standards until September 2007. During that time, implementation of BMP further reduced impacts of acid rock drainage; however, full compliance has not been achieved. The QCB is presently renewing MRRC’s discharge permit and will concurrently issue a new order. It is expected that the new 10-year permit will include an order requiring continued implementation of BMP through 2033 to address residual discharges of acid rock drainage. The Company currently estimates that it will spend between approximately $14.1 million and $16.1 million for remediation at these sites over the next 30 years and has accrued a reserve at the low end of this range. Lead Refinery Site U.S.S. Lead Refinery, Inc. (Lead Refinery), a non-operating wholly owned subsidiary of MRRC, has conducted corrective action and interim remedial activities (collectively, Site Activities) at Lead Refinery’s East Chicago, Indiana site pursuant to the Resource Conservation and Recovery Act since December 1996. Although the Site Activities have been substantially concluded, Lead Refinery is required to perform monitoring and maintenance-related activities pursuant to a post-closure permit issued by the Indiana Department of Environmental Management effective as of March 2, 2013. Approximate costs to comply with the post-closure permit, including associated general and administrative costs, are estimated at between $1.6 million and $2.4 million over the next 14 years. The Company has recorded a reserve at the low end of this range. On April 9, 2009, pursuant to the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), the U.S. Environmental Protection Agency (EPA) added the Lead Refinery site and surrounding properties to the National Priorities List (NPL). On July 17, 2009, Lead Refinery received a written notice from the EPA indicating that it may be a PRP under CERCLA due to the release or threat of release of hazardous substances including lead into properties surrounding the Lead Refinery NPL site. The EPA identified two other PRPs in connection with that matter. In November 2012, the EPA adopted a remedy for the surrounding properties and in September 2014, the EPA announced that it had entered into a settlement with the two other PRPs whereby they will pay approximately $26.0 million to fund the cleanup of approximately 300 properties surrounding the Lead Refinery NPL site (zones 1 and 3 of operable unit 1) and perform certain remedial action tasks. On November 8, 2016, the Company, its subsidiary Arava Natural Resources Company, Inc. (Arava), and Arava’s subsidiary MRRC each received general notice letters from the EPA asserting that they may be PRPs in connection with the Lead Refinery NPL site. The Company, Arava, and MRRC have denied liability for any remedial action and response costs associated with the Lead Refinery NPL site. In June 2017, the EPA requested that Lead Refinery conduct, and the Company fund, a remedial investigation and feasibility study of operable unit 2 of the Lead Refinery NPL site pursuant to a proposed administrative settlement agreement and order on consent. The Company and Lead Refinery entered into that agreement in September 2017. The Company has made a capital contribution to Lead Refinery to conduct the remedial investigation and feasibility study with respect to operable unit 2 and has provided financial assurance in the amount of $1.0 million. The remedial investigation and feasibility study remain ongoing. The EPA has also asserted its position that Mueller is a responsible party for the Lead Refinery NPL site, and accordingly is responsible for a share of remedial action and response costs at the site and in the adjacent residential area. In January 2018, the EPA issued two unilateral administrative orders (UAOs) directing the Company, Lead Refinery, and four other PRPs to conduct soil and interior remediation of certain residences at the Lead Refinery NPL site (zones 2 and 3 of operable unit 1). Subsequent thereto, the Company and Lead Refinery have reached agreement with the four other PRPs to implement these two UAOs, with the Company agreeing to pay, on an interim basis, (i) an estimated $4.5 million (subject to potential change through a future reallocation process) of the approximately $25.0 million the PRPs then estimated it would cost to implement the UAOs, which estimate is subject to change, and (ii) $2.0 million relating to past costs incurred by other PRPs for work conducted at the site, as well as the possibility of up to $0.7 million in further payments for ongoing work by those PRPs. As of July 1, 2023, the Company has made payments of approximately $7.6 million related to the aforementioned agreement with the other PRPs. The Company disputes that it was properly named in the UAOs. In March 2022, Lead Refinery entered into an administrative settlement agreement and order on consent with the EPA, along with the four other PRPs, which involves payment of certain past and future costs relating to operable unit 1, in exchange for certain releases and contribution protection for the Company, Lead Refinery, and their respective affiliates relating to that operable unit. The settlement became effective in September 2022. The Company reserved $3.3 million for this settlement at the end of 2021. In March 2018, a group of private plaintiffs sued the Company, Arava, MRRC, and Lead Refinery, along with other defendants, in civil tort action relating to the site. The Company, Arava, and MRRC have been voluntarily dismissed from that litigation without prejudice. Lead Refinery’s motion to dismiss the matter was granted without prejudice, but it has answered plaintiffs’ amended complaint. At this juncture, the Company is unable to determine the likelihood of a material adverse outcome or the amount or range of a potential loss in excess of the current reserve with respect to any remedial action or litigation relating to the Lead Refinery NPL site, either at Lead Refinery’s former operating site (operable unit 2) or the adjacent residential area (operable unit 1), including, but not limited to, EPA oversight costs for which the EPA may attempt to seek reimbursement from the Company, and past costs for which other PRPs may attempt to seek contribution from the Company. Bonita Peak Mining District Following an August 2015 spill from the Gold King Mine into the Animas River near Silverton, Colorado, the EPA listed the Bonita Peak Mining District on the NPL. Said listing was finalized in September 2016. The Bonita Peak Mining District encompasses 48 mining sites within the Animas River watershed, including the Sunnyside Mine, the American Tunnel, and the Sunbank Group. On or about July 25, 2017, Washington Mining Company (Washington Mining) (a wholly-owned subsidiary of the Company’s wholly-owned subsidiary, Arava), received a general notice letter from the EPA stating that Washington Mining may be a PRP under CERCLA in connection with the Bonita Peak Mining District site and therefore responsible for the remediation of certain portions of the site, along with related costs incurred by the EPA. Shortly thereafter, the Company received a substantively identical letter asserting that it may be a PRP at the site and similarly responsible for the cleanup of certain portions of the site. The general notice letters identify one other PRP at the site, and do not require specific action by Washington Mining or the Company at this time. At this juncture, the Company is unable to determine the likelihood of a materially adverse outcome or the amount or range of a potential loss with respect to any remedial action related to the Bonita Peak Mining District NPL site. Operating Properties Mueller Copper Tube Products, Inc. In 1999, Mueller Copper Tube Products, Inc. (MCTP), a wholly owned subsidiary, commenced a cleanup and remediation of soil and groundwater at its Wynne, Arkansas plant to remove trichloroethylene, a cleaning solvent formerly used by MCTP. On August 30, 2000, MCTP received approval of its Final Comprehensive Investigation Report and Storm Water Drainage Investigation Report addressing the treatment of soils and groundwater from the Arkansas Department of Environmental Quality (ADEQ). The Company established a reserve for this project in connection with the acquisition of MCTP in 1998. Effective November 17, 2008, MCTP entered into a Settlement Agreement and Administrative Order by Consent to submit a Supplemental Investigation Work Plan (SIWP) and subsequent Final Remediation Work Plan (RWP) for the site. By letter dated January 20, 2010, ADEQ approved the SIWP as submitted, with changes acceptable to the Company. On December 16, 2011, MCTP entered into an amended Administrative Order by Consent to prepare and implement a revised RWP regarding final remediation for the Site. The remediation system was activated in February 2014. Costs to implement the work plans, including associated general and administrative costs, are estimated to approximate $0.5 million to $0.7 million over the next three years. The Company has recorded a reserve at the low end of this range. United States Department of Commerce Antidumping Review On December 24, 2008, the Department of Commerce (DOC) initiated an antidumping administrative review of the antidumping duty order covering circular welded non-alloy steel pipe and tube from Mexico for the November 1, 2007 through October 31, 2008 period of review. The DOC selected Mueller Comercial as a respondent in the review. On April 19, 2010, the DOC published the final results of the review and assigned Mueller Comercial an antidumping duty rate of 48.33 percent. On May 25, 2010, the Company appealed the final results to the U.S. Court of International Trade (CIT). On December 16, 2011, the CIT issued a decision remanding the Department’s final results. While the matter was still pending, the Company and the United States reached an agreement to settle the appeal. Subject to the conditions of the agreement, the Company anticipated that certain of its subsidiaries would incur antidumping duties on subject imports made during the period of review and, as such, established a reserve for this matter. After the lapse of the statutory period of time during which U.S. Customs and Border Protection (CBP) was required, but failed, to liquidate the entries at the settled rate, the Company released the reserve. Between October 30, 2015 and November 27, 2015, CBP sent a series of invoices to Southland Pipe Nipples Co., Inc. (Southland), requesting payment of approximately $3.0 million in duties and interest in connection with 795 import entries made during the November 1, 2007 through October 31, 2008 period. On January 26, 2016 and January 27, 2016, Southland filed protests with CBP in connection with these invoices, noting that CBP’s asserted claims were not made in accordance with applicable law, including statutory provisions governing deemed liquidation. The Company believes in the merits of the legal objections raised in Southland’s protests, and CBP’s response to Southland’s protests is currently pending. Given the procedural posture and issues raised by this legal dispute, the Company cannot estimate the amount of potential duty liability, if any, that may result from CBP’s asserted claims. Guarantees Guarantees, in the form of letters of credit, are issued by the Company generally to assure the payment of insurance deductibles, certain retiree health benefits, and debt at certain unconsolidated affiliates. The terms of the guarantees are generally one year but are renewable annually as required. These letters are primarily backed by the Company’s revolving credit facility. The maximum payments that the Company could be required to make under its guarantees at July 1, 2023 were $28.9 million.

Income Taxes	6 Months Ended
Income Taxes	Jul. 01, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate for the second quarter of 2023 was 26 percent compared with 25 percent for the same period last year. The primary items impacting the effective tax rate for the second quarter of 2023 were increases related to the provision for state income taxes, net of the federal benefit, of $7.1 million and the effect of foreign tax rates higher than statutory tax rates and other foreign adjustments of $2.6 million. The items impacting the effective tax rate for the second quarter of 2022 were increases related to the provision for state income taxes, net of the federal benefit, of $9.8 million and the effect of foreign tax rates higher than statutory tax rates and other foreign adjustments of $1.7 million. The Company’s effective tax rate for the first half of 2023 was 26 percent compared with 25 percent for the same period last year. The items impacting the effective tax rate for the first half of 2023 were primarily attributable to the provision for state income taxes, net of the federal benefit, of $15.0 million and the effect of foreign tax rates higher than statutory tax rates and other foreign items of $4.6 million. The items impacting the effective tax rate for the first half of 2022 were primarily related to the provision for state income taxes, net of the federal benefit, of $16.9 million and the effect of foreign tax rates higher than statutory tax rates of $3.4 million. The Company files a consolidated U.S. federal income tax return and numerous consolidated and separate-company income tax returns in many state, local, and foreign jurisdictions. The statute of limitations is open for the Company’s federal tax return for 2019 and all subsequent years. The statutes of limitations for most state returns are open for 2019 and all subsequent years, and some state and foreign returns are also open for some earlier tax years due to differing statute periods. While the Company believes that it is adequately reserved for possible audit adjustments, the final resolution of these examinations cannot be determined with certainty and could result in final settlements that differ from current estimates.

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jul. 01, 2023

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

The following tables provide changes in AOCI by component, net of taxes and noncontrolling interests (amounts in parentheses indicate debits to AOCI):


	For the Six Months Ended July 1, 2023
(In thousands)	Cumulative Translation Adjustment		Unrealized Gain (Loss) on Derivatives		Pension/OPEB Liability Adjustment		Attributable to Unconsol. Affiliates		Total

Balance as of December 31, 2022	$	(69,238)	$	1,486	$	1,222	$	2,355	$	(64,175)

Other comprehensive income before reclassifications	18,012		1,006		148		1,638		20,804
Amounts reclassified from AOCI	—		(2,731)		(147)		—		(2,878)

Net current-period other comprehensive income (loss)	18,012		(1,725)		1		1,638		17,926


Balance as of July 1, 2023	$	(51,226)	$	(239)	$	1,223	$	3,993	$	(46,249)


	For the Six Months Ended June 25, 2022
(In thousands)	Cumulative Translation Adjustment		Unrealized Gain (Loss) on Derivatives		Pension/OPEB Liability Adjustment		Attributable to Unconsol. Affiliates		Total

Balance as of December 25, 2021	$	(42,303)	$	803	$	(11,500)	$	(347)	$	(53,347)

Other comprehensive (loss) income before reclassifications	(14,318)		(7,281)		(31)		4,409		(17,221)
Amounts reclassified from AOCI	—		(2,514)		152		—		(2,362)

Net current-period other comprehensive (loss) income	(14,318)		(9,795)		121		4,409		(19,583)


Balance as of June 25, 2022	$	(56,621)	$	(8,992)	$	(11,379)	$	4,062	$	(72,930)

Reclassification adjustments out of AOCI were as follows:


	Amount reclassified from AOCI
	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022		Affected line item

Unrealized gains on derivative commodity contracts	$	(960)	$	(1,021)	$	(3,511)	$	(3,245)	Cost of goods sold

	218		229		780		731		Income tax expense

	$	(742)	$	(792)	$	(2,731)	$	(2,514)	Net of tax and noncontrolling interests

Amortization of net loss and prior service cost on employee benefit plans	$	(99)	$	104	$	(197)	$	172	Other income, net
	25		(15)		50		(20)		Income tax expense (benefit)

	$	(74)	$	89	$	(147)	$	152	Net of tax and noncontrolling interests

Insurance Claims	6 Months Ended
Insurance Claims	Jul. 01, 2023
Insurance [Abstract]
Insurance Claims	Insurance Claims In August 2022, a portion of the Company’s Bluffs, Illinois manufacturing operation was damaged by fire. Certain inventories, production equipment, and building structures were extensively damaged. During the second quarter of 2023, the Company settled the claim with its insurer for total proceeds of $29.5 million, net of the deductible of $250 thousand. As a result of the settlement with the insurer, all proceeds received and all costs previously deferred (which were recorded as other current liabilities in prior periods) were recognized, resulting in a pre-tax gain of $19.5 million in the second quarter of 2023, or 26 cents per diluted share after tax. The Company received proceeds of $24.5 million and $5.0 million in 2023 and 2022, respectively. In March 2023, a portion of the Company’s Covington, Tennessee manufacturing operation was damaged by a tornado. The extent of the damage to inventories, production equipment, and building structures is currently being assessed. The total value of the loss, including business interruption, cannot be determined at this time, but is expected to be covered by property and business interruption insurance subject to customary deductibles. Any gain resulting from insurance proceeds for property damage in excess of the net book value of the related property will be recognized in income upon settlement of the claim. In addition, the Company has deferred recognition of direct, identifiable costs associated with this matter. These costs will also be recognized upon settlement of the insurance claim. As of July 1, 2023, the Company has received advances totaling $10.0 million from the insurance company for this claim. These advances, net of the book value of damaged inventories, equipment, and buildings and direct cleanup and other out of pocket costs totaled $3.6 million, classified as other current liabilities on the Condensed Consolidated Balance Sheet at July 1, 2023.

Disposition	6 Months Ended
Disposition	Jul. 01, 2023
Business Combination and Asset Acquisition [Abstract]
Disposition	Disposition On September 2, 2021, the Company entered into a contribution agreement with a limited liability company in the retail distribution business, pursuant to which the Company exchanged the outstanding common stock of Die-Mold for a 17 percent equity interest in the limited liability company. Die-Mold manufactures PEX and other plumbing-related fittings and plastic injection tooling in Canada and sells these products in Canada and the U.S. and was included in the Piping Systems Segment. Effective July 3, 2023, the Company transferred 100 percent of the outstanding shares of Heatlink Group, Inc. and Heatlink Group USA, LLC for an additional 11 percent equity interest in the limited liability company. During the third quarter, the Company will measure the gain or loss on the disposition by measuring the fair value of the consideration received (the 11 percent equity interest) against the carrying value of Heatlink Group, in accordance with Accounting Standards Codification 810-10, Consolidation. Any resulting gain or loss is expected to be immaterial to the Company’s Condensed Consolidated Financial Statements.

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Pay vs Performance Disclosure
Net income attributable to Mueller Industries, Inc.	$ 177,711	$ 206,552	$ 350,950	$ 364,868

Insider Trading Arrangements	3 Months Ended	6 Months Ended
Insider Trading Arrangements	Jul. 01, 2023 shares	Jul. 01, 2023 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On May 8, 2023, Steffen Sigloch, Chief Manufacturing Officer, entered into a 10b5-1 sales plan (the Sales Plan) intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act. The Sales Plan provides for the sale of up to an aggregate of 83,703 shares of the Company’s common stock beneficially owned by Mr. Sigloch during the term of the Sales Plan and will be in effect until the earlier of (1) February 7, 2025 and (2) the date on which an aggregate of 83,703 shares of the Company’s common stock have been sold under the Sales Plan.
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Arrangement Duration	641 days
Steffen Sigloch [Member]
Trading Arrangements, by Individual
Name	Steffen Sigloch
Title	Chief Manufacturing Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	May 8, 2023
Aggregate Available	83,703	83,703

Recent Accounting Standards (Policies)	6 Months Ended
Recent Accounting Standards (Policies)	Jul. 01, 2023
Accounting Changes and Error Corrections [Abstract]
Recently Adopted and Issued Accounting Standards	Adopted In October 2021, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2021-08, Business Combinations (Topic 805): An Amendment of the FASB Accounting Standards Codification. The new guidance was issued to improve accounting for acquired revenue contracts with customers in a business combination by addressing diversity in practice and inconsistency related to the (i) recognition of an acquired contract liability, and (ii) payment terms and their effect on subsequent revenue recognized by the acquirer. The ASU is effective for fiscal years beginning after December 15, 2022 for public entities. The updated guidance requires prospective adoption, and early adoption is permitted. The Company adopted the ASU during the first quarter of 2023. The adoption of the ASU did not have a material impact on the Company’s Condensed Consolidated Financial Statements. Issued In June 2022, the FASB issued ASU No. 2022-03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions. The new guidance was issued to clarify existing guidance measuring the fair value of an equity security subject to contractual restrictions that prohibit the sale of an equity security and introduce new disclosure requirements for applicable equity securities. The ASU is effective for fiscal years beginning after December 15, 2023 for public entities. The updated guidance requires prospective adoption, and early adoption is permitted. The Company does not expect the adoption of the ASU to have a material impact on its Condensed Consolidated Financial Statements.

Segment Information (Tables)

6 Months Ended

Jul. 01, 2023

Segment Reporting [Abstract]

Schedule of Segment Information

Summarized segment information is as follows:


	For the Quarter Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	638,005	$	146,266	$	123,954	$	(11,241)	$	896,984

Cost of goods sold	452,866		123,097		77,064		(13,755)		639,272
Depreciation and amortization	5,252		1,804		2,202		1,158		10,416
Selling, general, and administrative expense	28,745		3,394		7,087		16,836		56,062




Gain on insurance settlement	—		—		(19,466)		—		(19,466)

Operating income	151,142		17,971		57,067		(15,480)		210,700

Interest expense									(135)
Interest income									7,732
Unrealized gain on short-term investments									20,820
Other income, net									1,841

Income before income taxes									$	240,958

Segment information (continued):


	For the Quarter Ended June 25, 2022
(In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	824,807	$	179,175	$	164,484	$	(18,424)	$	1,150,042

Cost of goods sold	585,090		150,940		103,110		(18,226)		820,914
Depreciation and amortization	5,930		1,846		2,348		1,178		11,302
Selling, general, and administrative expense	22,208		2,221		8,279		16,248		48,956





Operating income	211,579		24,168		50,747		(17,624)		268,870

Interest expense									(147)
Interest income									103
Other income, net									2,100

Income before income taxes									$	270,926


	For the Six Months Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	1,300,484	$	311,500	$	276,908	$	(20,716)	$	1,868,176

Cost of goods sold	920,476		256,267		165,876		(24,549)		1,318,070
Depreciation and amortization	10,810		3,576		4,355		2,332		21,073
Selling, general, and administrative expense	54,202		6,471		15,088		32,932		108,693




Gain on insurance settlement	—		—		(19,466)		—		(19,466)

Operating income	314,996		45,186		111,055		(31,431)		439,806

Interest expense									(278)
Interest income									13,967
Unrealized gain on short-term investments									20,820
Other income, net									4,077

Income before income taxes									$	478,392

Segment information (continued):


	For the Six Months Ended June 25, 2022
( In thousands)	Piping Systems		Industrial Metals		Climate		Corporate and Eliminations		Total

Net sales	$	1,528,237	$	353,487	$	305,106	$	(26,786)	$	2,160,044

Cost of goods sold	1,099,277		296,650		197,067		(27,569)		1,565,425
Depreciation and amortization	11,330		3,790		4,700		2,323		22,143
Selling, general, and administrative expense	45,563		5,620		15,892		29,337		96,412
Gain on sale of assets	—		—		—		(5,507)		(5,507)




Operating income	372,067		47,427		87,447		(25,370)		481,571

Interest expense									(305)
Interest income									263
Other income, net									2,720

Income before income taxes									$	484,249

The following table presents total assets attributable to each segment:


(In thousands)	July 1, 2023		December 31, 2022

Segment assets:
Piping Systems	$	1,218,810	$	1,088,940
Industrial Metals	165,534		160,702
Climate	263,666		279,940
General Corporate	928,410		712,817

	$	2,576,420	$	2,242,399

Schedule of Disaggregation of Revenue From Contracts with Customers

The following tables represent a disaggregation of revenue from contracts with customers, along with the reportable segment for each category:


	For the Quarter Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Total

Tube and fittings	$	518,712	$	—	$	—	$	518,712
Brass rod and forgings	—		113,563		—		113,563
OEM components, tube & assemblies	—		21,073		33,007		54,080
Valves and plumbing specialties	119,293		—		—		119,293
Flex duct and other HVAC components	—		—		90,947		90,947
Other	—		11,630		—		11,630

	638,005		146,266		123,954		908,225

Intersegment sales							(11,241)

Net sales							$	896,984


	For the Quarter Ended June 25, 2022
(In thousands)	Piping Systems		Industrial Metals		Climate		Total

Tube and fittings	$	674,579	$	—	$	—	$	674,579
Brass rod and forgings	—		142,788		—		142,788
OEM components, tube & assemblies	—		20,254		32,526		52,780
Valves and plumbing specialties	150,228		—		—		150,228
Flex duct and other HVAC components	—		—		131,958		131,958
Other	—		16,133		—		16,133

	824,807		179,175		164,484		1,168,466

Intersegment sales							(18,424)

Net sales							$	1,150,042

Disaggregation of revenue from contracts with customers (continued):


	For the Six Months Ended July 1, 2023
(In thousands)	Piping Systems		Industrial Metals		Climate		Total

Tube and fittings	$	1,062,940	$	—	$	—	$	1,062,940
Brass rod and forgings	—		243,903		—		243,903
OEM components, tube & assemblies	—		43,582		66,409		109,991
Valves and plumbing specialties	237,544		—		—		237,544
Flex duct and other HVAC components	—		—		210,499		210,499
Other	—		24,015		—		24,015

	1,300,484		311,500		276,908		1,888,892

Intersegment sales							(20,716)

Net sales							$	1,868,176


	For the Six Months Ended June 25, 2022
(In thousands)	Piping Systems	Industrial Metals	Climate	Total

Tube and fittings	1,246,089	—	—	1,246,089
Brass rod and forgings	—	279,321	—	279,321
OEM components, tube & assemblies	—	40,350	61,618	101,968
Valves and plumbing specialties	282,148	—	—	282,148
Flex duct and other HVAC components	—	—	243,488	243,488
Other	—	33,816	—	33,816

	1,528,237	353,487	305,106	2,186,830

Intersegment sales				(26,786)

Net sales				$	2,160,044

Cash, Cash Equivalents, and Restricted Cash (Tables)

6 Months Ended

Jul. 01, 2023

Cash and Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents


(In thousands)	July 1, 2023		December 31, 2022

Cash & cash equivalents	$	771,317	$	461,018
Restricted cash included within other current assets	1,962		4,176
Restricted cash included within other assets	102		102

Total cash, cash equivalents, and restricted cash	$	773,381	$	465,296

Schedule of Restrictions on Cash and Cash Equivalents


(In thousands)	July 1, 2023		December 31, 2022

Cash & cash equivalents	$	771,317	$	461,018
Restricted cash included within other current assets	1,962		4,176
Restricted cash included within other assets	102		102

Total cash, cash equivalents, and restricted cash	$	773,381	$	465,296

Inventories (Tables)

6 Months Ended

Jul. 01, 2023

Inventory Disclosure [Abstract]

Schedule of Inventories


(In thousands)	July 1, 2023		December 31, 2022

Raw materials and supplies	$	158,302	$	133,189
Work-in-process	79,601		64,177
Finished goods	239,635		265,842
Valuation reserves	(11,809)		(14,289)

Inventories	$	465,729	$	448,919

Financial Instruments (Tables)

6 Months Ended

Jul. 01, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments Designated as Cash Flow Hedges Reflected in the Financial Statements

The following table summarizes the location and fair value of the derivative instruments and disaggregates the net derivative assets and liabilities into gross components on a contract-by-contract basis:


	Asset Derivatives					Liability Derivatives
		Fair Value					Fair Value
(In thousands)	Balance Sheet Location	July 1, 2023		December 31, 2022		Balance Sheet Location	July 1, 2023		December 31, 2022

Commodity contracts - gains	Other current assets	$	74	$	3,746	Other current liabilities	$	305	$	—
Commodity contracts - losses	Other current assets	(9)		(1,483)		Other current liabilities	(814)		—

Total derivatives (1)		$	65	$	2,263		$	(509)	$	—

(1) Does not include the impact of cash collateral provided to counterparties.

Schedule of Fair Value Hedges

The following tables summarize the effects of derivative instruments on the Company’s Condensed Consolidated Statements of Income:

For the Quarter Ended

For the Six Months Ended

(In thousands)

Location

July 1, 2023

June 25, 2022

July 1, 2023

June 25, 2022

Undesignated derivatives:

Gain (loss) on commodity contracts (nonqualifying)

Cost of goods sold

427

12,457

(2,057)

15,882

Schedule of Activities Related to Derivative Instruments Classified as Cash Flow Hedges

The following tables summarize amounts recognized in and reclassified from AOCI during the period:


	For the Quarter Ended July 1, 2023
(In thousands)	(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	(1,961)	Cost of goods sold	$	(742)
Other	24		Other	—

Total	$	(1,937)	Total	$	(742)

Amounts recognized in and reclassified from AOCI (continued):


	For the Quarter Ended June 25, 2022
(In thousands)	(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	(11,107)	Cost of goods sold	$	(792)
Other	13		Other	—

Total	$	(11,094)	Total	$	(792)


	For the Six Months Ended July 1, 2023
(In thousands)	Gain (Loss) Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	1,008	Cost of goods sold	$	(2,731)
Other	(2)		Other	—

Total	$	1,006	Total	$	(2,731)


	For the Six Months Ended June 25, 2022
(In thousands)	(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax		Classification Gains (Losses)	Gain Reclassified from AOCI (Effective Portion), Net of Tax

Cash flow hedges:
Commodity contracts	$	(7,326)	Cost of goods sold	$	(2,514)
Other	45		Other	—

Total	$	(7,281)	Total	$	(2,514)

Investments in Unconsolidated Affiliates (Tables)

6 Months Ended

Jul. 01, 2023

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Summarized Financial Information Derived From the Company's Equity Method Investee's Consolidated Financial Statements


(In thousands)	July 1, 2023		December 31, 2022

Current assets	$	230,018	$	248,808
Noncurrent assets	94,763		77,395
Current liabilities	182,462		190,746
Noncurrent liabilities	51,391		43,003


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Net sales	$	111,741	$	126,337	$	225,159	$	252,304
Gross profit	22,822		26,257		42,638		45,032
Net (loss) income	(1,244)		7,375		(5,961)		6,169

Benefit Plans (Tables)

6 Months Ended

Jul. 01, 2023

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Cost (Income)

The components of net periodic benefit cost (income) are as follows:


	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022

Pension benefits:

Interest cost	$	595	$	393	$	1,189	$	787
Expected return on plan assets	(842)		(967)		(1,683)		(1,934)
Amortization of net loss	—		243		—		487

Net periodic benefit income	$	(247)	$	(331)	$	(494)	$	(660)

Other benefits:
Service cost	$	50	$	72	$	101	$	144
Interest cost	128		103		256		206
Amortization of prior service cost (credit)	—		(79)		(1)		(197)
Amortization of net gain	(99)		(60)		(196)		(118)
Curtailment gain	—		$	(1,756)	—		$	(1,756)

Net periodic benefit cost (income)	$	79	$	(1,720)	$	160	$	(1,721)

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jul. 01, 2023

Equity [Abstract]

Schedule of Changes in AOCI by Component, Net of Taxes and Noncontrolling Interest

The following tables provide changes in AOCI by component, net of taxes and noncontrolling interests (amounts in parentheses indicate debits to AOCI):


	For the Six Months Ended July 1, 2023
(In thousands)	Cumulative Translation Adjustment		Unrealized Gain (Loss) on Derivatives		Pension/OPEB Liability Adjustment		Attributable to Unconsol. Affiliates		Total

Balance as of December 31, 2022	$	(69,238)	$	1,486	$	1,222	$	2,355	$	(64,175)

Other comprehensive income before reclassifications	18,012		1,006		148		1,638		20,804
Amounts reclassified from AOCI	—		(2,731)		(147)		—		(2,878)

Net current-period other comprehensive income (loss)	18,012		(1,725)		1		1,638		17,926


Balance as of July 1, 2023	$	(51,226)	$	(239)	$	1,223	$	3,993	$	(46,249)


	For the Six Months Ended June 25, 2022
(In thousands)	Cumulative Translation Adjustment		Unrealized Gain (Loss) on Derivatives		Pension/OPEB Liability Adjustment		Attributable to Unconsol. Affiliates		Total

Balance as of December 25, 2021	$	(42,303)	$	803	$	(11,500)	$	(347)	$	(53,347)

Other comprehensive (loss) income before reclassifications	(14,318)		(7,281)		(31)		4,409		(17,221)
Amounts reclassified from AOCI	—		(2,514)		152		—		(2,362)

Net current-period other comprehensive (loss) income	(14,318)		(9,795)		121		4,409		(19,583)


Balance as of June 25, 2022	$	(56,621)	$	(8,992)	$	(11,379)	$	4,062	$	(72,930)

Schedule of Reclassification Adjustments Out of AOCI

Reclassification adjustments out of AOCI were as follows:


	Amount reclassified from AOCI
	For the Quarter Ended				For the Six Months Ended
(In thousands)	July 1, 2023		June 25, 2022		July 1, 2023		June 25, 2022		Affected line item

Unrealized gains on derivative commodity contracts	$	(960)	$	(1,021)	$	(3,511)	$	(3,245)	Cost of goods sold

	218		229		780		731		Income tax expense

	$	(742)	$	(792)	$	(2,731)	$	(2,514)	Net of tax and noncontrolling interests

Amortization of net loss and prior service cost on employee benefit plans	$	(99)	$	104	$	(197)	$	172	Other income, net
	25		(15)		50		(20)		Income tax expense (benefit)

	$	(74)	$	89	$	(147)	$	152	Net of tax and noncontrolling interests

Earnings per Common Share (Details) - shares shares in Thousands	3 Months Ended
	Jul. 01, 2023	Jun. 25, 2022
Earnings Per Share [Abstract]
Stock-based awards excluded from computation of diluted earnings per share (in shares)	0	8

Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022	Dec. 31, 2022
Summary of segment information [Abstract]
Net sales	$ 896,984	$ 1,150,042	$ 1,868,176	$ 2,160,044
Cost of goods sold	639,272	820,914	1,318,070	1,565,425
Depreciation and amortization	10,416	11,302	21,073	22,143
Selling, general, and administrative expense	56,062	48,956	108,693	96,412
Gain on insurance settlement	(19,466)	0	(19,466)	0
Gain on sale of assets	0	0	0	(5,507)
Operating income	210,700	268,870	439,806	481,571
Interest expense	(135)	(147)	(278)	(305)
Interest income	7,732	103	13,967	263
Unrealized gain on short-term investments	20,820	0	20,820	0
Other income, net	1,841	2,100	4,077	2,720
Income before income taxes	240,958	270,926	478,392	484,249
Assets	2,576,420		2,576,420		$ 2,242,399
Operating Segments
Summary of segment information [Abstract]
Net sales	908,225	1,168,466	1,888,892	2,186,830
Operating Segments \| Piping Systems
Summary of segment information [Abstract]
Net sales	638,005	824,807	1,300,484	1,528,237
Cost of goods sold	452,866	585,090	920,476	1,099,277
Depreciation and amortization	5,252	5,930	10,810	11,330
Selling, general, and administrative expense	28,745	22,208	54,202	45,563
Gain on insurance settlement	0		0
Gain on sale of assets				0
Operating income	151,142	211,579	314,996	372,067
Assets	1,218,810		1,218,810		1,088,940
Operating Segments \| Industrial Metals
Summary of segment information [Abstract]
Net sales	146,266	179,175	311,500	353,487
Cost of goods sold	123,097	150,940	256,267	296,650
Depreciation and amortization	1,804	1,846	3,576	3,790
Selling, general, and administrative expense	3,394	2,221	6,471	5,620
Gain on insurance settlement	0		0
Gain on sale of assets				0
Operating income	17,971	24,168	45,186	47,427
Assets	165,534		165,534		160,702
Operating Segments \| Climate
Summary of segment information [Abstract]
Net sales	123,954	164,484	276,908	305,106
Cost of goods sold	77,064	103,110	165,876	197,067
Depreciation and amortization	2,202	2,348	4,355	4,700
Selling, general, and administrative expense	7,087	8,279	15,088	15,892
Gain on insurance settlement	(19,466)		(19,466)
Gain on sale of assets				0
Operating income	57,067	50,747	111,055	87,447
Assets	263,666		263,666		279,940
Corporate and Eliminations
Summary of segment information [Abstract]
Net sales	(11,241)	(18,424)	(20,716)	(26,786)
Cost of goods sold	(13,755)	(18,226)	(24,549)	(27,569)
Depreciation and amortization	1,158	1,178	2,332	2,323
Selling, general, and administrative expense	16,836	16,248	32,932	29,337
Gain on insurance settlement	0		0
Gain on sale of assets				(5,507)
Operating income	(15,480)	$ (17,624)	(31,431)	$ (25,370)
Assets	$ 928,410		$ 928,410		$ 712,817

Segment Information - Schedule of Disaggregation of Revenue From Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 896,984	$ 1,150,042	$ 1,868,176	$ 2,160,044
Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	908,225	1,168,466	1,888,892	2,186,830
Operating Segments \| Piping Systems
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	638,005	824,807	1,300,484	1,528,237
Operating Segments \| Industrial Metals
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	146,266	179,175	311,500	353,487
Operating Segments \| Climate
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	123,954	164,484	276,908	305,106
Operating Segments \| Tube and fittings
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	518,712	674,579	1,062,940	1,246,089
Operating Segments \| Tube and fittings \| Piping Systems
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	518,712	674,579	1,062,940	1,246,089
Operating Segments \| Tube and fittings \| Industrial Metals
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| Tube and fittings \| Climate
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| Brass rod and forgings
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	113,563	142,788	243,903	279,321
Operating Segments \| Brass rod and forgings \| Piping Systems
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| Brass rod and forgings \| Industrial Metals
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	113,563	142,788	243,903	279,321
Operating Segments \| Brass rod and forgings \| Climate
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| OEM components, tube & assemblies
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	54,080	52,780	109,991	101,968
Operating Segments \| OEM components, tube & assemblies \| Piping Systems
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| OEM components, tube & assemblies \| Industrial Metals
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	21,073	20,254	43,582	40,350
Operating Segments \| OEM components, tube & assemblies \| Climate
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	33,007	32,526	66,409	61,618
Operating Segments \| Valves and plumbing specialties
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	119,293	150,228	237,544	282,148
Operating Segments \| Valves and plumbing specialties \| Piping Systems
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	119,293	150,228	237,544	282,148
Operating Segments \| Valves and plumbing specialties \| Industrial Metals
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| Valves and plumbing specialties \| Climate
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| Flex duct and other HVAC components
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	90,947	131,958	210,499	243,488
Operating Segments \| Flex duct and other HVAC components \| Piping Systems
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| Flex duct and other HVAC components \| Industrial Metals
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| Flex duct and other HVAC components \| Climate
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	90,947	131,958	210,499	243,488
Operating Segments \| Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	11,630	16,133	24,015	33,816
Operating Segments \| Other \| Piping Systems
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Operating Segments \| Other \| Industrial Metals
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	11,630	16,133	24,015	33,816
Operating Segments \| Other \| Climate
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	0	0	0	0
Intersegment sales
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ (11,241)	$ (18,424)	$ (20,716)	$ (26,786)

Cash, Cash Equivalents, and Restricted Cash - Schedule of Cash and Cash Equivalents and Restrictions on Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022	Jun. 25, 2022	Dec. 25, 2021
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 771,317	$ 461,018
Restricted cash included within other current assets	1,962	4,176
Restricted cash included within other assets	102	102
Total cash, cash equivalents, and restricted cash	$ 773,381	$ 465,296	$ 217,315	$ 90,376

Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 158,302	$ 133,189
Work-in-process	79,601	64,177
Finished goods	239,635	265,842
Valuation reserves	(11,809)	(14,289)
Inventories	$ 465,729	$ 448,919

Financial Instruments - Narrative (Details) - USD ($)	6 Months Ended
Financial Instruments - Narrative (Details) - USD ($)	Jul. 01, 2023	Dec. 31, 2022
Derivative [Line Items]
Restricted cash in other current assets as collateral related to open derivative contracts	$ 1,900,000	$ 4,000,000
Commodity contracts
Derivative [Line Items]
Deferred net losses, net of tax, included in AOCI	(400,000)
Cash Flow Hedging \| Commodity contracts \| Long
Derivative [Line Items]
Open option contracts written, at fair value	$ 24,700,000
Time period for open copper future contract purchases	9 months
Fair value of future contracts with net gain (loss) position	$ (500,000)
Fair Value Hedging \| Commodity contracts \| Short
Derivative [Line Items]
Fair value of future contracts with net gain (loss) position	3,000
Open future contracts to sell copper	$ 500,000
Time period for open copper future contract sales	11 months

Financial Instruments - Schedule of Derivative Instruments Designated as Cash Flow Hedges Reflected in the Financial Statements (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	Jul. 01, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Total derivative assets	$ 65	$ 2,263
Total derivative liabilities	(509)	0
Other current assets \| Commodity contracts
Derivatives, Fair Value [Line Items]
Other current assets: Gain positions	74	3,746
Other current assets: Loss positions	(9)	(1,483)
Other current liabilities \| Commodity contracts
Derivatives, Fair Value [Line Items]
Other current liability: Gain positions	305	0
Other current liability: Loss positions	$ (814)	$ 0

Financial Instruments - Schedule of Fair Value Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Commodity contracts \| Cost of goods sold \| Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on commodity contracts (nonqualifying)	$ 427	$ 12,457	$ (2,057)	$ 15,882

Financial Instruments - Schedule of Activities Related to Derivative Instruments Classified as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax	$ (2,679)	$ (11,886)	$ (1,725)	$ (9,795)
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax	(1,937)	(11,094)	1,006	(7,281)
Gain Reclassified from AOCI (Effective Portion), Net of Tax	(742)	(792)	2,731	2,514
Commodity contracts \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax	(1,961)	(11,107)	1,008	(7,326)
Commodity contracts \| Cash Flow Hedging \| Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Gain Reclassified from AOCI (Effective Portion), Net of Tax	(742)	(792)	2,731	2,514
Other \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) Gain Recognized in AOCI (Effective Portion), Net of Tax	24	13	(2)	45
Gain Reclassified from AOCI (Effective Portion), Net of Tax	$ 0	$ 0	$ 0	$ 0

Investments in Unconsolidated Affiliates - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Schedule of Equity Method Investments [Line Items]
Net (loss) income	$ 179,551	$ 207,524	$ 354,644	$ 366,772
Retail Distribution Business
Schedule of Equity Method Investments [Line Items]
Net (loss) income	1,300	1,200	2,700	1,900
Tecumseh Products Holdings LLC
Schedule of Equity Method Investments [Line Items]
Net (loss) income	$ (600)	$ 3,700	$ (3,000)	$ 3,100
Tecumseh Products Holdings LLC
Schedule of Equity Method Investments [Line Items]
Interest in the joint venture, ownership percentage	50.00%		50.00%
Retail Distribution Business
Schedule of Equity Method Investments [Line Items]
Interest in the joint venture, ownership percentage	17.00%		17.00%

Investments in Unconsolidated Affiliates - Schedule of Summarized Financial Information Derived From the Company's Equity Method Investee's Consolidated Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022	Dec. 31, 2022
Balance sheet data [Abstract]
Current assets	$ 1,851,736		$ 1,851,736		$ 1,534,653
Current liabilities	344,548		344,548		348,295
Income Statement [Abstract]
Net sales	896,984	$ 1,150,042	1,868,176	$ 2,160,044
Net (loss) income	179,551	207,524	354,644	366,772
Tecumseh
Balance sheet data [Abstract]
Current assets	230,018		230,018		248,808
Noncurrent assets	94,763		94,763		77,395
Current liabilities	182,462		182,462		190,746
Noncurrent liabilities	51,391		51,391		$ 43,003
Income Statement [Abstract]
Net sales	111,741	126,337	225,159	252,304
Gross profit	22,822	26,257	42,638	45,032
Net (loss) income	$ (1,244)	$ 7,375	$ (5,961)	$ 6,169

Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Pension Benefits
Components of net periodic benefit cost (income) [Abstract]
Interest cost	$ 595	$ 393	$ 1,189	$ 787
Expected return on plan assets	(842)	(967)	(1,683)	(1,934)
Amortization of net loss (gain)	0	243	0	487
Net periodic benefit cost (income)	(247)	(331)	(494)	(660)
Other Benefits
Components of net periodic benefit cost (income) [Abstract]
Interest cost	128	103	256	206
Amortization of net loss (gain)	(99)	(60)	(196)	(118)
Service cost	50	72	101	144
Amortization of prior service cost (credit)	0	(79)	(1)	(197)
Curtailment gain	0	(1,756)	0	(1,756)
Net periodic benefit cost (income)	$ 79	$ (1,720)	$ 160	$ (1,721)

Commitments and Contingencies (Details) $ in Millions	1 Months Ended					6 Months Ended	12 Months Ended
Commitments and Contingencies (Details) $ in Millions	Mar. 31, 2022 potentially_responsible_party	Feb. 28, 2022 USD ($) smelter_site ft	Jan. 31, 2018 USD ($) potentially_responsible_party unilateral_administrative_order	Nov. 27, 2015 USD ($)	Aug. 31, 2015 mining_site	Jul. 01, 2023 USD ($) potentially_responsible_party smelter_site property	Oct. 31, 2008 import_entry	Dec. 25, 2021 USD ($)	Nov. 08, 2016 USD ($)	Apr. 19, 2010
Loss Contingencies [Line Items]
Term of guarantees						1 year
Payments required to be made under guarantees, maximum						$ 28.9
United States Department of Commerce Antidumping Review
Loss Contingencies [Line Items]
Assignment of antidumping duty rate on U.S. imports by Company subsidiaries (as a percent)										48.33%
Payment for interest and duties				$ 3.0
Number of import entries \| import_entry							795
Southeast Kansas Sites
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, gross		$ 5.6
Geographic boundary of sites \| ft		50
Southeast Kansas Sites \| Non operating Properties
Loss Contingencies [Line Items]
Number of former smelter sites \| smelter_site		3				3
Number of parties involved in settlement negotiations \| potentially_responsible_party						2
Southeast Kansas Sites - Lanyon \| Operating Properties
Loss Contingencies [Line Items]
Number of properties in remediation \| property						1,371
Shasta Area Mine Sites \| Non operating Properties
Loss Contingencies [Line Items]
Period of permit, implementation of best management practices						10 years
Estimated remediation costs, term						30 years
Shasta Area Mine Sites \| Non operating Properties \| Minimum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 14.1
Shasta Area Mine Sites \| Non operating Properties \| Maximum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 16.1
Lead Refinery Site
Loss Contingencies [Line Items]
Financial guarantee									$ 1.0
Lead Refinery Site \| Non operating Properties
Loss Contingencies [Line Items]
Number of parties involved in settlement negotiations \| potentially_responsible_party						2
Estimated remediation costs, term						14 years
Amount other PRPs will pay to fund cleanup						$ 26.0
Number of surrounding properties \| property						300
Lead Refinery Site \| Non operating Properties \| Minimum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 1.6
Lead Refinery Site \| Non operating Properties \| Maximum
Loss Contingencies [Line Items]
Estimated remediation costs						2.4
Lead Refinery NPL Site
Loss Contingencies [Line Items]
Number of UAOs \| unilateral_administrative_order			2
Number of PRPs \| potentially_responsible_party	4		4
Environmental reserves			$ 4.5
Site contingency, total costs			25.0
Site contingency, amount agreed upon to pay PRPs for past costs			2.0
Site contingency, additional reimbursement of past costs			$ 0.7
Contingency charge						$ 7.6
Reserve for settlement								$ 3.3
Bonita Peak Mining District
Loss Contingencies [Line Items]
Number of mining sites \| mining_site					48
Mueller Copper Tube Products, Inc. \| Operating Properties
Loss Contingencies [Line Items]
Estimated remediation costs, term						3 years
Mueller Copper Tube Products, Inc. \| Operating Properties \| Minimum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 0.5
Mueller Copper Tube Products, Inc. \| Operating Properties \| Maximum
Loss Contingencies [Line Items]
Estimated remediation costs						$ 0.7

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Income Tax Disclosure [Abstract]
Effective tax rate	26.00%	25.00%	26.00%	25.00%
Provision for state income taxes, net of federal benefits	$ 7.1	$ 9.8	$ 15.0	$ 16.9
Effect of foreign tax rates differential	$ 2.6	$ 1.7	$ 4.6	$ 3.4

Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in AOCI by Component, Net of Taxes and Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			$ 1,813,964
Other comprehensive income before reclassifications			20,804	$ (17,221)
Amounts reclassified from AOCI			(2,878)	(2,362)
Total other comprehensive income (loss), net	$ 5,408	$ (27,044)	17,890	(21,172)
Balance at end of period	2,142,938		2,142,938
Total
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period	(51,951)	(47,442)	(64,175)	(53,347)
Total other comprehensive income (loss), net	5,702	(25,488)	17,926	(19,583)
Balance at end of period	(46,249)	(72,930)	(46,249)	(72,930)
Cumulative Translation Adjustment
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			(69,238)	(42,303)
Other comprehensive income before reclassifications			18,012	(14,318)
Amounts reclassified from AOCI			0	0
Total other comprehensive income (loss), net			18,012	(14,318)
Balance at end of period	(51,226)	(56,621)	(51,226)	(56,621)
Unrealized Gain (Loss) on Derivatives
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			1,486	803
Other comprehensive income before reclassifications			1,006	(7,281)
Amounts reclassified from AOCI			(2,731)	(2,514)
Total other comprehensive income (loss), net			(1,725)	(9,795)
Balance at end of period	(239)	(8,992)	(239)	(8,992)
Pension/OPEB Liability Adjustment
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			1,222	(11,500)
Other comprehensive income before reclassifications			148	(31)
Amounts reclassified from AOCI			(147)	152
Total other comprehensive income (loss), net			1	121
Balance at end of period	1,223	(11,379)	1,223	(11,379)
Attributable to Unconsol. Affiliates
Changes in accumulated other comprehensive income [Roll Forward]
Balance at beginning of period			2,355	(347)
Other comprehensive income before reclassifications			1,638	4,409
Amounts reclassified from AOCI			0	0
Total other comprehensive income (loss), net			1,638	4,409
Balance at end of period	$ 3,993	$ 4,062	$ 3,993	$ 4,062

Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassification Adjustments Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ 62,122	$ 68,290	$ 123,479	$ 122,489
Net of tax and noncontrolling interests	(177,711)	(206,552)	(350,950)	(364,868)
Other income, net	(1,841)	(2,100)	(4,077)	(2,720)
Unrealized gains on derivative commodity contracts \| Amount reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	(960)	(1,021)	(3,511)	(3,245)
Income tax expense	218	229	780	731
Net of tax and noncontrolling interests	(742)	(792)	(2,731)	(2,514)
Amortization of net loss and prior service cost on employee benefit plans \| Amount reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	25	(15)	50	(20)
Net of tax and noncontrolling interests	(74)	89	(147)	152
Other income, net	$ (99)	$ 104	$ (197)	$ 172

Insurance Claims (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 01, 2023	Jul. 01, 2023	Jun. 25, 2022
Insurance [Abstract]
Total proceeds from insurance settlement	$ 29,500
Insurance deductible	250
Insurance recovery, pretax gain	$ 19,500
Insurance recovery, gain per diluted share, after tax (in USD per share)	$ 0.26
Proceeds from insurance settlement received		$ 24,500	$ 5,000
Insurance advances	$ 10,000	10,000
Insurance advances, net	$ 3,600	$ 3,600

Disposition (Details)	Jul. 03, 2023	Sep. 30, 2023	Sep. 02, 2021
Heatlink Group, Inc. \| Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Exchange \| Subsequent Event
Business Acquisition [Line Items]
Ownership interest transferred (as a percent)	100.00%
Retail Distribution Business
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)			17.00%
Retail Distribution Business \| Forecast
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)		11.00%
Retail Distribution Business \| Subsequent Event
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)	11.00%