Hromee Automatic Tire Deflators Kit for Jeep, Cars, Trucks, ATV 6-30 PSI Adjustable Air Deflating Set with Gauge

Spring loaded pressure valves can vary a bit, but if you take a few extra minutes to set them up properly and give them the best chance to work well, they are pretty accurate and consistent.These work by using a spring and corresponding adjustable cap to vary the release valve pressure required to close the valve. The majority of the mechanics are brass and likely a light stainless or coated steel spring, but there are also rubber gaskets and o-rings.To get the most consistent accuracy, my advise is:1) to disassemble (carefully) and lightly oil the o-rings with a silicone lubricant.2) reassemble3) set4) reinflate tire and test5) adjust6) repeat 4-5 as often as needed to get consistency7) lock the set ring down (with dual pliers)8) test again (revisit 4-5 if adjustment is needed)After about 30 min, my tires consistently drop to 20# every time, regardless of which tire or which deflator I am using. Checked them in the garage in the morning...and again in the sun in the afternoon...20# on the nose each time.Yes they can vary by 1-2# either way (it's a wire spring so precision is gonna be tough) so set them about 1-2# over your lowest comfortable pressure and spot adjust as needed (realistically, running 10% from your target isn't going to make much of a difference (18# v 20# or 15# vs 17.5#)) But to be cautious set it 10% ABOVE your lowest desired pressure, you can always drop more manually but adding back is a pain.Running 33s on a 4runner and takes about 3-4 min to drop from 35# to 20#.

A friend recommended these to use when we purchased a Jeep to drive on the beach. Once you adjust each device to the tire pressure you want, they work great and same a whole lot of time so you can drive on the beach.

I went to my first jeep event and started to deflate the tires by hand. It took me about 30 minutes to complete. I still didn't deflate enough. I talked to a guy who was a veteran and he said I to go down to 15 psi. I started to deflate some more when he pulled out his deflaters. He deflated the tires the rest of the way. I bought these before I went Jeeping again. They work ok. I'm not certain if they are the best on the market. You set them. It takes a few attempts then you lock them in place. They only work for the tire size you set them for. I set them for my 33 inch tires. I tried them on someone else's 35 inch tires and they didn't deflate correct. I had to reset them. The last time I went out jeeping one of the units was loose so I had to wing it. Overall worth the money just in time you save.

Very helpful at the beach! We have used this many times since purchasing. Highly Recommend!

Went out to the desert in Borrego with my brothers to do some fun and semi challenging off roading. My one brother had this exact set of deflators and they worked great! It was nice that they came in sets of 4 so you could debate all at once. My brother did say, that it did take some trial and error to get them set to the wanted PSI (we were at 20),and that it was no big deal. They seem to be well made, and now I have to set mine!

I was about to try the $90 ones and saw these, Read reviews and thought to give it a try. Dang they work great! Watch a youtube video on how to set the first one on first tire. Then use that tire at correct pressure to set the remaining three. Once they are all set just jump out when you want to air down, walk around and put on each tire. in about 4-5 min all are done at at set pressure (I use 13lbs) I absolutely love these, makes air down so fast and easy, No longer sticking my key into valve and squatting down for 20 mins to air down. Just screw these on, tend to other things and take off once air releasing stops

My #1 wish for these is that they had some pre-set psi markings, or some notching feelings when turning so you could get to the right psi quickly and consistently.Takes trial and error but i've found they can give different PSIs from the same tyre e.g. if you get the tyre to the psi you want then plug on each of the deflators and make sure they're set at that psi, you can see the nut is not in the same position on some of the deflators and when you use them on other tyres they give different psis. In one example one of the deflators was about 5 psi off somehow. Need to do more testing, maybe i'll get them honed in one day.

Instead of having to hold down a valve stem or possible loosening it up and losing it, you just set these, place them on all 4 tires and chill till they sound they are done. Well worth it.