The TowSmart 4-Wire Flat to 4-Wire Flat Extension Connector is the quickest and easiest way to make electrical connections between your vehicle and trailer when towing. Extends your current 4-Wire Flat connector by 12 in. The extra connector length provides extra slack for sufficient trailer turning radius or additional flexibility at the end of the trailer 4-wire flat. Provides stop, turn, ground, and taillight functions. Features an ergonomic, durable plastic construction that is corrosion resistant to withstand extreme weather.