Only top brass make it at Mueller Industries -- that, and copper and aluminum. The company makes materials used to make Mueller tubes and fittings, bars and rods, forgings, extrusions, pipes, and valves. Mueller also resells a myriad of products, from brass and plastic plumbing valves to faucets and malleable iron fittings. Its work is divided between two segments: Plumbing and Refrigeration (a Standard Products Division, and European and Mexican Operations) and OEM (Industrial and Engineered Products Divisions, and Chinese joint venture Mueller-Xingrong).