Product Details: The Haldex 1/4" NPT Immediate Response Height Control Valve is a high-quality, non-time delay valve designed to inflate or deflate air springs to maintain suspension ride height. This valve features 1/4" NPT ports and does not include a dump or linkage kit. It is designed to provide an immediate response to changes in suspension height, allowing for a smooth and comfortable ride. The valve is easy to install and is ideal for use in a variety of applications, including trucks, trailers, and other vehicles. FleetPride is your First Click in Heavy Duty®.