Product Details: Ensure your truck is prepared for the long road with a comfortable ride and suspension height, with the OTR Hadley Style Height Control Valve with Expertise Built In™. Due 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. Constructed with an advanced body to quickly replenish air levels after dumping cargo loads. FleetPride is your First Click in Heavy Duty®.