Usage Tips:7 Pin Male Female Trailer Socket - Fits 7 Pin Heavy European Standard Trailer, Establishes a secure connection between your vehicle and additional major trailer, Transfers electronic signal lights from vehicle to trailer, Ideal for tow bars or to replace damaged plugs on existing cars. European Standard --- Passes Europe CE, ROHS Certification, trusted standard wiring system for European trailers, reliable and safe performance, waterproof for all road and weather conditions. High Quality Material --- Carefully selected sturdy and stable materials, the 7-pole plug has brass round pins, waterproof and durable, long service life and durable. perfect sealing. Widely Used --- Works great with caravans, trucks, RVs, boats and trailers, provides easy connections ons for indicators, position lights, brake lights and fog lights, powers your caravan, trailer and truck.