The ProClass 7 Blade Connector Trailer Wiring Kit provides what you need to make electrical connections when hauling a trailer that has a different configuration than the vehicle. The single housing design mounts to your vehicle and splices into trailer wiring to provide a superior connection. The 7-way blade connector is commonly used on RV trailers and connects tail lights, brake lights, turn signals and reverse lights. It provides an ergonomic, durable plastic construction that is corrosion-resistant to withstand extreme weather. For the safest towing, ensure all functions are properly equipped.