Powers 12-volt devices, like a tire inflator, vacuum, coffee maker and more. Lie-flat design for seamless installations with M10 (3/8-inch) hole size. Water resistant cap to protect the female socket from the elements. Built-in fused connection for protection against short circuit. High-conductivity 16 AWG copper wire and rated capacity of 15-amperes. Molded strain reliefs prevent unwanted strain on the wire connections.