"This Reliance Plastic Inlet Box is ideal for use with the Pro/Tran transfer switches and Panel/Link manual transfer panels and generator-ready load centers. UL Listed Yes, Amps 30, Volts 125/250, Dimensions L x W x H in. 6 3/4 x 7 1/2 x 4 3/4, Application Connect generator to transfer switch or other panel. Durable high-impact, UV-resistant ABS construction Over 100 cubic inches of wiring space with three 1/2in. and 3/4in. combination knockouts Heavy-duty weatherproof flip-lid standard Slide-out base permits 360 access to the flanged inlet"