WIDE APPLICATION: The three-hole plug has a wide range of applications. It works great with trailers, tractors, agricultural machinery, utility vehicles, RVs, caravans, trucks, campers and boats, etc. FUNCTION: The socket 12V 3-pin trailer connector is used to provide a stable connection of the lighting circuit between the tractor and the trailer, caravan, etc. The trailer plug is used to easily connect the lighting to the trailer. PLUG & PLAY: Plug and play, easy to install. PREMIUM QUALITY: 3 pin plug with waterproof silicone rubber seal, the contact pin has good conductivity, the plastic shell can prevent rust or corrosion, safe and reliable performance. REPLACEMENT: 12V 3 pin trailer socket is your perfect old replacement, can replace old and damaged sockets well.