SmartPlug"s 50 Amp 125 Volt/250 Volt Inlets have been designed to be used with 3-wires (125 Volt) or 4-wires (250 Volt) in a single inlet. The inlet connector provides 20X"s more electrical contact area eliminating the overheating conditions seen with twist-type connectors. The solid sleeve connection and weatherproof seal makes it a preferred option. The mounting flange holes match existing inlets so it can be easily installed to replace the old twist-type inlet products in minutes. The inlets are available in stainless steel and three non-metallic colors, (White, Black or Gray), of high performance/flame resistant material.