This 7-pin trailer side connector is the wiring connector you need to power your tractor battery to a tractor that is towing your vehicle to a tail light or turn signal. Heavy duty alloy trailer plugs and sockets are designed to keep the plug out while driving. Can be installed on your own tow trailer kit or bike trailer. In addition, you can keep it as a spare for repair to reduce accidents and failures while driving. A must have accessory for those who frequently use towing couplers. couplers, hitch pins, hitch balls, tow trailers, wiring connectors, connectors, bike trailers, wiring, trailers