Get Ready for the Road Ahead with the Ride-Air Controls 3/8" NPT 4-Way Single Solenoid Control Valve, a replacement product that integrates with a wide range of pneumatic applications. Thanks to its multitude of ports, this valve is able to efficiently regulate the flow of air throughout the idle and active vehicles, and disperse air as needed to avoid excessive hydraulic pressure. Produced with manual or electric operation components for simple use within the lift axle applications. FleetPride is your First Click in Heavy Duty .