This 13 to 7 pin plug adapter trailer connector is suitable for European standard trailers. It supplies power to your towing and truck, converting the 13-pin socket on your car to the 7-pin female socket. The adapter establishes a secure connection between your major vehicle and the additional trailer, transferring electronic signal lights from the vehicle to the trailer. The weather-proof sprung locking flap protects the connections when not in use and locks in the 7-pin plug when in use.