Shop Nilight 7 Way RV Blade to 6 Way Round Trailer Wiring Adapter Plug Vehicle Side 7 Pin to Trailer Side 6 Pin Round for Trailer Tow Hitch Car RV Boat Truck-Center Pin Brake Lights in high quality, support 2 Years Warranty. Standard plug internal design with strong fixing, this trailer hitch wiring adapter plugs into any standard 7-way RV blade, connecting the taillights/turn signals/trailer brakes and brake lights.