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JT Brooks Automatic Tire Deflators Standard Set Reviews
These are rather cumbersome - the Rugged Ridge Brass ones are a lot better; easier to set up and use.
These deflator are of good quality and after following the easy process for setting the cutoff point for deflation repeat within 1 psi of original set point. So, depending on your level of impatience they do not deflate quickly. I tested on my OEM tires for my Rubicon and it took 3 minutes 35 seconds to deflate from 37 to 20 PSI. These are 255 75 17 tires. If you have tires with more volume expect more time. For me this is acceptable but not five star worthy, especially at such a price point.