Converts Car's 13-pin Socket: This trailer plug adapter converts the car's 13-pin socket to a 7-pin female socket. Durable Design: The environmentally friendly nylon housing prevents rust and lasts a long time. With the waterproof protective cover and spring, the trailer plug is suitable for all weather conditions and can remain permanently on the vehicle. Easy Installation: Simply connect this small adapter to the 13-pin socket and then connect your standard 7-pin plug on the other side. After pushing the adapter halfway into the socket, turn it 90 degrees (1/4 turn to the right) clockwise to secure it in place. Suitable for European Standard Trailers: This 13-pin to 7-pin plug is suitable for European standard trailers. It can power your caravan, trailer, and truck. Establish a stable and secure connection between your host vehicle and the towed vehicle and transmit electronic light signals near the trailer.