Leviton 278-PM 30Amp, 125/250Volt, NEMA 14-30R, Panel Mounting Receptacle, Industrial Grade, Grounding, Strap, Black Fits all wallplates with 2.15" diameter center hole Terminals marked for easy identification and fast wiring All mounting hardware included Easy-to-wire terminals accept up to No. 4 AWG conductors 10 Year Limited Warranty