Like trailer hitches and ball mounts, electrical connectors range all over the board in shape, size and capability, but no matter what your trailer's electrical functions are, you need a solid connection to keep the power flowing and ensure safety on the road. CURT electrical connectors are designed and manufactured to give you a reliable connection every time you plug in your trailer. These 4-way round connectors are designed to supply power for tail lights, turn signals and brake lights, as well as a ground connection. They feature durable die-cast metal construction and come with concealed terminals and a spring-loaded steel cover to resist damage from dust and water. This 4-way round connector kit includes both a male-end plug for your trailer and a female-end socket for your vehicle.