Monster Valves are oversized, light weight yet strong valve stems that you install as a second stem to your wheel.
Made from 7018 alumnum, 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.
Monster Valves are FAST! What else will deflate a 40" tire 1 PSI per Second?! Steve found that the easiest way to use his Monster Valves most efficiently was to use the clip-on pressure gauge on his stock valve. This way he can monitor his dropping tire pressure so he knows exactly when to close the collar. The same goes for inflating. The clip-on tire pressure gauge saves time because you know exactly when to stop filling.