mueller industries, inc. (nyse: mli) is an industrial manufacturer specializing in copper and copper alloy manufacturing while also producing goods made from aluminum, steel, and plastics. headquartered in memphis, tennessee, the company comprises a network of operations in the united states, canada, mexico, great britain, and china. products include tubing, fittings, valves, vessels, and related items for plumbing, hvacr, and related piping systems, as well as rod, forgings, extrusions, and various components for oem applications. products are distributed into sectors such as building construction, appliance, defense, energy, and automotive.