Update your vehicle to be Ready for the Road Ahead with the Hendrickson 1/8" NPT Air Regulator, a replacement part designed for a wide range of pneumatic operations. With a regulating component that controls the volume of air throughout the suspension system, this air valve is able to reduce pressure (overloading). Fashioned with durable components for long-lasting performance in active and idle engines. FleetPride is your First Click in Heavy Duty .