| State or Country | ||
| Subsidiary* | of Incorporation | |
| ATCO Rubber Products, Inc. | Michigan | |
| Mueller Brass Holding Company, Inc. | Delaware | |
| Mueller Brass Co. (Assumed name: Mueller Brass Products) | Michigan | |
| Extruded Metals, Inc.  | Delaware | |
| Mueller Industrial Realty Co. | Michigan | |
| Itawamba Industrial Gas Company, Inc. | Mississippi | |
| Streamline Copper & Brass Ltd. | Canada | |
| Mueller Plastics Holding Company, Inc. | Ohio | |
| Mueller Plastics Corporation, Inc. | Delaware | |
| MPC Foundry, Inc. | Delaware | |
| MPC Machine Shop, Inc. | Delaware | |
| Mueller Brass Forging Company, Inc. | Delaware | |
| Mueller Copper Tube Company, Inc. | Delaware | |
| Mueller Fittings, LLC | Mississippi | |
| Mueller Fittings Company, Inc. | Michigan | |
| MCTC, LLC | Mississippi | |
| Mueller East, Inc. | Delaware | |
| Mueller Formed Tube Company, Inc. | Delaware | |
| Mueller Impacts Company, Inc. | Delaware | |
| Mueller Press Company, Inc. | Mississippi | |
| Mueller Refrigeration Products Company, Inc. | Delaware | |
| Mueller LBHC, Inc. | Delaware | |
| Lincoln Brass Works, Inc. (Assumed name: Mueller Gas Products) | Michigan | |
| Overstreet-Hughes, Co., Inc. (Assumed name: Fabricated Tube Products) | Tennessee | |
| Mueller Refrigeration LLC | Delaware | |
| Mueller Refrigeration Holding Company, Inc. | Delaware | |
| Mueller Streamline Co. | Delaware | |
| B&K, LLC (d/b/a BK Products) | Delaware | |
| Precision Tube Company, LLC | Pennsylvania | |
| Mueller Southeast, Inc. | Pennsylvania | |
| Southland Pipe Nipples Company, Inc. | Texas | |
| Mueller Tool and Machine, Inc. | Delaware | |
| Mueller Casting Company, Inc. | Delaware | |
| Mueller Packaging, LLC | Mississippi | |
| Micro Gauge, Inc. | Michigan | |
| Microgauge Machining, Inc. | Michigan | |
| Propipe Technologies, Inc. (Assumed name: Mueller Gas Products) | Ohio | |
| WTC Holding Company | Michigan | |
| MA Industrial Secured Lending, LLC (4) | Delaware | |
| Muellux Holding Company I SARL | Luxembourg | |
| Muellux Holding Company II SARL | Luxembourg | |
| Mueller Middle East B.S.C. (7) | Bahrain | |
| State or Country | ||
| Subsidiary* | of Incorporation | |
| Mueller Europe Investment Company Ltd. | United Kingdom | |
| Jungwoo Metal Ind. Co., Ltd.  (5) | South Korea | |
| Mueller Europe, Limited | United Kingdom | |
| Westermeyer Industries, Inc. | Illinois | |
| Sherwood Valve Products, Inc. | Ohio | |
| Sherwood Valve LLC     | Delaware | |
| DENO Investment Company, Inc. | Michigan | |
| Mueller de Mexico, S.A. de C.V. (1) | Mexico | |
| DENO Holding Company, Inc. | Michigan | |
| B & K Industries, Inc. | Illinois | |
| Mueller Copper Tube Products, Inc. | Delaware | |
| MCTP, LLC | Michigan | |
| Howell Metal Company | Virginia | |
| Turbotec Products, Inc. | Connecticut | |
| Mueller Canada Holding Co. Ltd. | Alberta | |
| Pexcor Manufacturing Co., Inc. | Alberta | |
| Heatlink Group, Inc. | Alberta | |
| Great Lakes Copper Ltd. | Nova Scotia | |
| Die-Mold Tool Limited | Ontario | |
| Linesets, Inc. | Delaware | |
| Climate Components, LLC | Delaware | |
| Arava Natural Resources Company, Inc. | Delaware | |
| United States Fuel Company | Nevada | |
| King Coal Company | Utah | |
| Canco Oil & Gas Ltd. | Alberta, Canada | |
| Aegis Oil and Gas Leasing Ltd. | Alberta, Canada | |
| Bayard Mining Corp. | Delaware | |
| Washington Mining Company | Maine | |
| Amwest Exploration Company | Delaware | |
| USSRAM Exploration Company | Maine | |
| White Knob Mining Company | Idaho | |
| Arava Exploration Company | Colorado | |
| Summit Systems, Inc. | Delaware | |
| Kennet Company Limited (liquidated 9/2018) | Bermuda | |
| Mining Remedial Recovery Company | Delaware | |
| Carpentertown Coal & Coke Company | Pennsylvania | |
| U.S.S. Lead Refinery, Inc. | Maine | |
| Leon Water Enterprises, Inc. (50%) | Texas | |
| Macomber Construction Company | Ohio | |
| Macomber, Incorporated | Ohio | |
| Macomber Building and Land Corporation | Delaware | |
| DENO Investment Company II, Inc. | Michigan | |
| Tecumseh Products Holdings LLC (6) | Delaware | |
| Tecumseh Products Co. | Michigan | |
| MII Financial Corporation | Michigan | |
| Mueller Streamline Holding S.L.U. | Spain | |
| WTC HoldCo I, LLC | Delaware | |
| WTC HoldCo II, LLC | Delaware | |
| State or Country | ||
| Subsidiary* | of Incorporation | |
| Mueller Comercial de Mexico S. de R.L. de C.V. (2) | Mexico | |
| NICNA Mexico, S. de R.L. de C.V. (3) | Mexico | |
| NICNA Mexico Servicios, S. de R.L. de C.V. (3) | Mexico | |
| NICNA Mexico Proyectos, S. de R.L. de C.V. (3) | Mexico | |
| Mueller Streamline II, LLC | Delaware | |
| Changzhou Mueller Refrigerant Valve Manufacturing Co., Ltd. | China | |
| Mueller Industries Trading (Shanghai) Co., Ltd. | China | |
| Mueller Streamline Trading, LLC | Delaware | |
| Mueller Streamline China, LLC | Delaware | |