Product Details: Ensure your semi is outfitted with components with Expertise Built In™ with the OTR 1/4" NPT 4-Way Electric Solenoid Valve for Air Cylinder, a product that provides advanced control of fluid movement and timing. Due to its specialized design, this replacement valve is able to manage the flow of fluids in the pneumatic system by automatically purging or dispelling fluids as needed. Constructed with reactive electric components to offer a rapid response time and increased reliability. FleetPride is your First Click in Heavy Duty®.