Conntek 80601-GYBX 30 Amps 125/250 Volts Power Inlet Box, For Generators Up to 7,500 Watts, Grey Cap Configuration: NEMA L14-30P (30 Amps, 125/250 Volts) For Use With Generators Up to 7,500 Running Watts 4 Combination 1/2 &  knockouts Grey Cap for Additional Personalization Recommended Cord Sets: TE-20601 or Any Variation of 20601