RV Designer's S981 AC Flush Mount Receptacle features a 50 Amp, 125/250 Volt (4-wire) NEMA 14-50R rating. Fits all wall-plates with 2.15" diameter center hole. Only accepts 8, 6, and 4 gauge Copper Wires (AWG). Neutral wire is required and can be applicable to 125V or 250V applications and up to 50 Amps. Fits in BOTH single and 2-Gang box styles. Terminals marked for easy identification and fast wiring. Black outlet made of thermoplastic body and heat resistant material.