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. This 4-way round connector is designed to supply power for tail lights turn signals and brake lights as well as a ground connection. It features durable die-cast metal construction and has concealed terminals to resist damage from dust and water. This 4-way round connector is a male-end plug specifically designed for the trailer side of the connection.