This CURT 7-way round RV blade connector is designed to supply power for tail lights, turn signals, electric trailer brakes, a 12-volt battery, reverse lights and brake lights, as well as a ground connection. It features rust-free black plastic construction and is a male-end plug, specifically designed for the trailer side of the connection. 7-way RV blades are typically used on RV travel trailers, and this particular connector can be easily interchanged with other 7-way RV connectors.