Recessed housing is die-formed 16 gauge, electro-galvanized steel, coated in white polyester and suitable for installation in concrete pour; Gasketed doors and frames are cast aluminum, coated in metallic aluminum polyester, with stainless steel piano hinges, and locking or non-locking latches; Receptacle mounting plates and voltage barriers are .080" aluminum; Factory installed wiring devices or combinations are available as illustrated; Integrated voltage barrier is provided, allowing low and high voltage devices to be installed in one box; Recessed housing has eight 1/2", 3/4",1" combination conduit knockouts, four for each device compartment; cETLus electrical Metallic Outlet Box listed for installation in wet locations