Polarized 7 contact heavy gauge drawn steel cadmium-plated trailer socket.  For automobile, truck, marine, and RV use.  Spring loaded cover holds plug in place and keeps out elements when not in use.  Heavy duty contacts are capable of up to 40 amps.  Is interchangable with other popular 7-way connectors.  Mounting holes are 2-15/16 on centers.  For use with trailer plug TC-73725.