Amazon.com: TOOLIOM 50 Amp Generator Power Inlet Box, NEMA SS2-50P Power Inlet Box for 3 Prong Generator Cord, 125/250 Volt, Up to 12500 Watts, Weatherproof Generator Inlet Box with Light Indicator, ETL
AC WORKS 20A Locking 4-Prong L14-20 Heavy-Duty Generator Transfer Switch Inlet Box in the Generator Power Inlet Boxes department at Lowes.com
Reliance Controls PBN50 50-Amp Power Inlet Box Non-Metallic
Reliance PB50 Inlet Power Box is Not Great. Watch Before Buying! - YouTube
Reliance Controls PB50RC Pb50 Power Inlet Box, 50 a, 125/250 V, Gray: Generator Accessories (851890000294-1)
Amazon.com: Reliance Controls PB50 50-Amp (CS6375) NEMA 3R Power Inlet Box,Gray : Patio, Lawn & Garden