Equip your semi truck to be Ready for the Road Ahead , with the Muncie Air Shift Hydraulic Valve, a key component that releases hydraulic pressure. Thanks to its ability to expel hydraulic pressure, this replacement valve is the ideal option to keep a system safe from over-pressurization. Crafted with an adjustable pressure feature to allow for manual regulation of the internal hydraulic pressure. FleetPride is your First Click in Heavy Duty .