PN#57674  SKU#4693  Dual Output Electrical Adapter With Tester (Adds 7 Way RV Blade To 4 Way Flat). 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. Integrated LED tester confirms proper function of vehicle-side wiring connector. Dust covers included to keep connectors clean when not in use. Slit loom keeps wires contained and well protected. Metal bracket securely mounts wiring to the vehicle or trailer hitch.