Boomba Check Valve prevents reverse flow in vacuum and boost lines. It takes just 0.25 Psi to open check valve in forward direction. In reverse direction Check Valve can hold pressure up to 100 Psi. Check Valve has fittings designed for 5 mm (3/16") hose. Available in red and black anodized finishes.
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I am adding boost to my '81 Z28 and wanted to make sure I didn't back pressure all my vacuum actuated dampers throughout the factory AC system. This little gem did the trick. No worries about damaging the old school system.