The TowSmart 4 Wire Flat Trailer Wiring Y-Harness Connector is the quickest and easiest way to make electrical connections between your vehicle and trailer when towing. The one-piece construction with bonded wire provides stop, turn, ground and taillights. Features two brown taillight wires for routing on both sides of the trailer to the taillights and possesses an ergonomic, durable plastic construction that is corrosion resistant to withstand extreme weather.