For 7-13-pin socket-check this trailer dust plug bracket, and after stopping the trailer, insert the 13-pin plug, 13-7-pin plug or 7-13-pin socket adapter into the socket. Protection-the lever bracket with locking nose locks the adapter firmly and is easy to install. You only need a key (not included). Use this jack bracket to protect the copper contacts from damage. High-quality materials-This trailer connector bracket is made of high-quality metal and ABS plastic, which is resistant to high temperature, strong and difficult to break. Align the drawbar-align the drawbar adapter socket on the drawbar. This is a really convenient and practical traction accessory, and it is your good choice. Large design-this trailer adapter protection can be used for doors-bicycles, furniture-homes or horse trailers, waterproof and dustproof covers. specifications: project type: trailer antifouling plug adapter material: ABS+Metal Application: Trailer list of bags: 1st trailer bracket