Eaton WD1225 30-Amp 3-Pole 4-Wire 125-Volt Surface Mount Dryer Power Receptacle, Black Features heavy galvanized steel and mounting strap to resist corrosion. Patented lay-in terminals accept up to #4 AWG Back features concentric knockouts and an adjustable cord clamp to allow wiring from back and bottom Features 3-Pole/4-Wiring with a Nema Standard of 14-30R with 125/250 Voltage. Total Outlet: 1 To be used with aluminum or copper wiring