Adjustable Auto-Stop Tire Air Down Kit (10-30 PSI) Screw-on Tyre Deflator Tool for Offroad 4x4 Vehicle Accessories

I have been using these to air down when overlanding. These work very well. They hold their settings. Zero issues. Price is right!

Very handy and quick!

I've been trying to decide on a good air down solution and decided to try these because I was also ordering a Samout compressor. What I like about these over the type that removes the valve stem core is that I can just screw them all on and not bend down the whole time I'm trying to air down. They seem to be stout and they are very easy to use. The only reason I said I like them "mostly" is because two of them easily adjusted to 21psi and turned off perfectly. One of them took quite a few tries and effort to get it to 21 and I finally just accepted 22psi. And the last one took me some time to realize that it was "closing" at about 21psi but it didn't close right so it was still slowly letting it air. It was coming out fast enough that I thought it was just still working but it was going on for awhile so I checked and the tire was at 15psi. After adjusting and testing it a few times I realized I was hearing it "pop closed" and the air flow was reducing, just not stopping. I checked the pressure when I heard that sound and it was about 23psi. I adjusted it again and got it close to 21psi when I hear the pop close sound, I just have to be sure I'm paying attention. Overall they are a really fast way to air down with minimal bending or kneeling required. And if you care, the Samout compressor is fantastic so far.

These made airing down to 15psi effortless. I threaded one on each of the 4 valve stems in the parking lot and let them work while I set up my bumper flags and other equipment, They stopped right at 15-16psi, happy with the accuracy. Took them off and back into the provided carry case and hit the dunes.

Seems like an accurate way to deflate.