Curt Manufacturing 57672 Towing Wiring Adapts a 4-way flat socket to fit 4-way flat and 7-way RV blade trailer plugs 4-way flat output connects tail lights, brake lights and turn signals 7-way connects tail, brake, reverse, turn signals, brakes and auxiliary power Dust covers included to keep connectors clean when not in use Slit loom keeps wires contained and well protected