This AC works brand inlet wiring device is a heavy-duty power input connection device. It is used for an industrial and commercial grade flange inlet. This inlet works with 18 to 10 AWG (American Wire-Gauge) copper wire and is commonly used for boats, RVs, small trailers or cabins. Note: 18-Gauge is for 10 Amp, 16-Gauge is for 13 Amp, 14-Gauge is for 16 Amp, 12-Gauge is for 20 Amp, and 10-Guage is for 30 Amp. The product features a 20 Amp household power input connection [NEMA 5-20P] and is a straight blade flange inlet with Front and Back Weather Cover. It has a 2-pole, 3-wire grounding system with a nylon casing and is back wired. Other popular uses for this product are RV and Electric Vehicle charging ports. California Residents: See Proposition 65 Information RV/EV C Amp power inlet 20 Amp, 125-Volt Inlet NEMA 5-20P Power Inlet UL and C-UL certified 1-year limited warranty.