Product Details: Outfit your semi to be Ready for the Road Ahead™ with a comfortable ride and suspension height, with the Haldex PR Plus Side Manifold Height Control Valve. With a sophisticated design, this replacement valve is able to regulate the compressed air levels of a vehicle's suspension, allowing operators to increase or decrease ride height as needed. Manufactured with an advanced body to quickly replenish air levels after dumping cargo loads. FleetPride is your First Click in Heavy Duty®.