Product Details: Prepare your semi truck to be Ready for the Road Ahead™, with the Sealco 1/4" Pressure Control Valve that offers reliable pressure regulation. This replacement device works to maintain the pressure within a hydraulic or pneumatic system, protecting the components from over pressurization or pressure drops. Fashioned with a multipurpose design to use on a wide variety of machinery. FleetPride is your First Click in Heavy Duty®.