The Reese Towpower 4-Way Flat Extension Wiring Connector is designed to handle basic lighting connections on small trailers. It's a simple, reliable wiring connector that features 18 gauge bonded wire and conforms to SAE spec J1128 - which will allow it to fit most 4-flat connectors on the market. The 4-flat complete connector loop can be used as an extension or cut and spliced to meet your needs when repairing existing connectors on either the vehicle or the trailer. You also need not worry about it rusting out either, because this connector comes with tin plated terminals to prevent rusting from even occurring!