Product Details: Get your semi Ready for the Road Ahead™ with a comfortable suspension and ride height, with the Hendrickson 1/4" PTC 3-Port Height Control Valve. This replacement valve works to regulate the compressed air levels of a vehicle's suspension, allowing operators to increase or decrease ride height as needed. Engineered with an innovative body to quickly replenish air levels after dumping cargo loads. FleetPride is your First Click in Heavy Duty®.