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.
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.
Single Monster Valve