Adjustable Auto-Stop Tire Deflator Valve Kit, 10-30 PSI Air Down Tool Offroad Accessories, 4 PCS

Have purchased other styles and weren't accurate or easy to set. Very impressed with this set of deflators. Must have for airing down.

Bought some other cheapos similar to this brand that were absolute junk, so I was a little skeptical getting these. The first set up was easy, the part that made me skeptical is the amount of time it took deflate to 15 psi. Which only took 4 minutes. Instant winner.

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They a good quality. So far so good!

I use these for my XJ as I change the tire pressure based on the weather and if I am on or off road. I generally run 27 psi cold in my tires when it's warm and I'm on road driving but I go to 20 psi when it's snowing or I'm offroad. Granted this isn't much of a difference which may be my problem but I noticed that when I put these on the valve stems I always have to pull on the ends to get them to deflate. Sometimes I have to do it multiple times before they stop letting air out, but when I install my TPMS caps it reads 5 psi lower on 2 of the tires. I'm not sure why it's doing that but the TPMS gauge is accurate as I have verified it with a tire inflator. So for some reason 2 of my deflators let out some extra air which could be an issue depending on how low you need to go or what type of terrain you're going over. Some day I'll actually remember this while I'm using them and set them accordingly so I don't have to deal with it after the air is out. Other than that they're pretty nice deflators that come with a little carry case and are super easy to use. Release the set ring and screw them apart, or together, to get to the desired psi level and tighten the ring. Then screw them onto the valve stems, supposedly they'll start automatically but that is not my personal experience. As mentioned before though that could be because of the low amounts of air I am releasing. If they don't start on their own you just pull the end out and it will start the process of releasing air. Wait until they stop and then remove them and put them back in the bag for next time.