Make the wiring easier-plug and play, convert the car's 4-pin flat socket into a trailer 7-pin blade circular socket, synchronize the trailer signal lights, and customize the plug-in system to connect the trailer. The plug and play is very convenient, which solves the problem of each renewal. Trouble with wiring.High-quality manufacturing-Pure copper is used as the core, which greatly improves the conductivity. Use high-quality PVC shell, wear-resistant, corrosion-resistant, effective waterproof, and long service life.Provides additional protection-Spring-loaded cover is used, which is highly dust-proof to avoid damage to the external environment when the adapter is not in use.Simple installation-equipped with mounting brackets, screws and nuts, you only need to find a suitable location to install and tighten the nuts to successfully install.Wide range of applications-suitable for all tractors that do not require electric brakes, including trailers, semi-trailers, RVs, etc. Is your original synchronous trailer wiring system too complicated?Don't worry, the 4-way flat to 7-way circular adapter can customize the plug-in wiring system for you to connect to the trailer It converts a 4-pin flat socket to a 7-pin blade circular socket, plug and play, and easily synchronize the trailer's taillights and turn signals.Spring coverThe spring cover is highly dust-proof and moisture-proof, providing better protection and preventing the adapter from being damaged by the external environment.Longer service lifeThe high-quality PVC shell is used to protect the wires, which is sturdy and durable, effectively waterproof, and has a longer service life.Easy to installEquipped with mounting brackets, screws and nuts, the installation is very simple, and it is widely used in most towing vehicles, including trailers, semi-trailers, RVs, etc.The package includes:1x trailer adapter plug1x mounting bracket6x screws6x nut