This is basically a check valve and a pressure valve. Inside is a small ball that moves and a spring that pushes on it. My little ball got stuck and I either lost all of my thrust to the 10psi spool valve or it got stuck the other way and I got 23psi. It worked for a while, then not anymore. then it became such that no air went through no matter what. Don't waste money. Get an electronic boost controller, it's safer.
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