Ensure your semi is Ready for the Road Ahead with seamless control of its tarp system, with the Shur-Co 12V 40A 4-Terminal Heavy Duty Rotary Tarp Switch. Due to its ability to activate the tarp mechanism of a vehicle, this replacement component is able to help quickly cover loads. Constructed with a 4-terminal design to efficiently transfer power to various wires. FleetPride is your First Click in Heavy Duty .