7-Pin 3M Trailer Extension Cable: A 7-pin trailer extension cable connector that creates a connection between your vehicle and an additional trailer, transmitting electronic signal lights from vehicle to trailer. European Standard: Certified 7-pin trailer connector extension cable suitable for towing most European cars, tractors, boats, truck brake lines, trailers, box vans, and container transporters. Connects your car's signal lights to the trailer. Easy Installation: 7-core trailer cable/7-pin trailer light cable extension, male to female, easy to install. Provides power to your caravan, tow, and truck, preventing breakdowns. Waterproof & Durable: Made from high-quality PU/TPU material with a durable casing. Long lifespan, durable, waterproof material. High elasticity and durability. Wide Application: 3m long 7-pin trailer extension cable (male to male) suitable for extending the cable when towing most European caravans/motorhomes/tractors/trailer connectors/cars/trucks/brake connections/trailers/box vans/container transporters.