Bought a new air supply hose today and hooked it all up only to hear air leaking. After two hours of tearing all the fittings down and re-taping the quick release was leaking and the main pressure gauge were still leaking. Had to remove the quick release and could still hear air flowing through the regulator. It ended up being my triple manifold. Removed that and went back to one hose set up and I am leak free again. The manifold was over twenty five yeas old and I use mini quick releases on my airbrush hoses anyways. I have found that the Iwata quick release wear out vary fast. I have an older one that is a generic one and that still works like a charm.