Product Details: Equip your semi truck to be Ready for the Road Ahead™, with the Bendix TR-3 Series 40 psi Die Cast Zinc Inversion Valve, a key piece that provides enhanced control of pneumatic accessories. With a sophisticated design, this replacement valve is able to regulate the flow of compressed air, switching the direction of the flow between two ports as needed. Crafted with a durable body to be suitable for a wide range of operating temperatures. FleetPride is your First Click in Heavy Duty®.