Product Details: Ensure your semi is Ready for the Road Ahead™ with a comfortable suspension and ride height, with the Haldex 1/8" NPT Height Control Valve. Thanks to its 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. Crafted with an innovative body to quickly replenish air levels after dumping cargo loads. FleetPride is your First Click in Heavy Duty®.