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Monster Valves are oversized, light weight yet strong valve stems that you install as a second stem to your wheel. Made from 7018 aluminum, they are the FASTEST tire deflation product on the market. Imagine airing down a 39.5x13.50 tire down 30 PSI in 30 seconds. This kit also includes a Monster Chuck which, when used with a Power Tank, will inflate that same tire in 50-60 seconds. And they are EASY to install into steel or aluminum wheels. Just drill a 7/16" hole, tap 1/4" NPT threads, and screw them in. Done.