Product Details: Equip your semi truck to be Ready for the Road Ahead™, with the PAI Low Pressure Switch, a key component that provides enhanced pneumatic system safety. By utilizing a specialized design, this replacement switch is able to monitor the pressure of a system to engage / disengage the compressor to keep the air pressure at a stable level. Built with an easy-to-install and streamlined design. FleetPride is your First Click in Heavy Duty®.