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Check Valves

 
Check valves are one way valves that are usually used in conjunction with a compressor to allow air flow into the tank, without it leaking back out through the compressor. They can also be used with manifolds like the AccuAir VU4 which require back pressure in order to keep the valves shut. This allows the tank to be removed for service or drained, while allowing the vehicle to maintain its ride height.