Rimrock RAD - Rapid Air Deflator

We smoothed the edges of the hole to avoid cutting the grommet.	Then, we inserted the RAD through the wheel and seated the grommet.	Next, we installed the flat washer and tightened the locknut on the backside of the RAD. We made sure to trim off the excess threads. Excess threads could actually puncture a tire if you have really low air pressure and hit something hard enough to drive the tire into the threads. A cutoff wheel made this very easy.
When installing the RAD, one uses a special nut (provided) to help get the RAD on tight. In this photo, you can clearly see some of the 12 holes that allow air to escape from the tire.	We installed the knurled nut and valve cap.	With the RAD installed, we were ready for the tires and a little testing. Total install time for five RADs was about 90 minutes. The first one took about 30 minutes, and the last one took about 10 minutes.
After we mounted the 37-inch BFG Krawlers, we aired up to 25 psi.	Using a popular deflator, we aired down from 25 psi to 6 psi in 1 minute and 28 seconds. Using the old "pull-the-valve-core" method and using a gauge on the RAD, we aired down in 1:13. Airing down using only the stock valve stem and checking pressure on the same stem netted us a time of 1:36. This included removing and reinstalling the core.	Using the RAD, we aired down to 6 psi in 35 seconds. That's fast for a 37-inch-tall tire. Using a gauge on the stock valve stem makes airing down quick and easy.