Sirr0und Leviton Surface Welder Outlet Power grounding outlet; 2-pole, 3-wire. UL (Underwriter's Laboratories) listed to accept aluminum or copper conductors. Maximum 4 AWG. Diameter 2.15". 50A/250V. Black. NEMA 6-50R. MPN# 5378 SKU# 532203UPC# 78477100233