ALL-TOP Adjustable Auto-Stop Tire Deflator Valve Kit (10-30 PSI) 4 PCS Screw-on Tyre Air Down Tool for Offroad 4x4 (with 5 Valve caps)

These are a great product! I have another set that looks identical to the Stauns, and these All-Top deflators work much better. These are consistent, but that depends on user care in consistently setting the desired pressure. These start very smoothly and shut off nicely. The lesser performing deflators had a simple flat-head valve seat, but the All-Tops use a chamfered valve seat, and I believe that is why they perform so smoothly and consistently.For my test, I set the deflation to a bit less than 20psi on the front tires and a bit less than 30psi for the rears. The fronts (both) automatically deflated to 18.5psi, and both rears went to 28.5psi. The reason for being less than the marked 20 and 30psi was that I set them just below the lines instead of exactly on the lines. The differences were trivial in terms of driving performance. One thing to be aware of is that after use, the adjustment should be backed out as much as possible without disassembling the units in order to relieve the spring compression and extend the product life.

Simple and easy to use. Just need to remember the setting will deflate from original pressure. Example if tire pressure is 40 psi and you dial the setting to 25 then you will deflate tires to 15 psi. it took me a second to figure that out

Initially all four were substantially off. However use them once or twice and readjust and they will be fantastic. All are within one PSI now. Would definitely buy again if lost, “borrowed”, or damaged.

Test each one as they're off a TINY bit. Worth the double check

Fast! Accurate! A few minutes a tire (35”) from 38 psi to 18 psi. Within a PSI of setting every time. Only complaint is the screw ring to lock in desired pressure is not secure enough. Screwing onto the valve stem can cause the lock ring to move and mess up your setting. You have to make sure and twist from the base in order to not accidentally move the ring that sets the pressure. Other than that, great product.

I purchased these tire deflators from All-Top because I had previously purchased their air compressor set up for inflating tires and was impressed. I had read reviews and watched a lot of videos online about tire deflators and Staun seemed to be the gold standard, but the $99 Price tag was daunting and I wanted to ensure I wasn’t missing out due to quality or accuracy concerns if I purchased these from All-Top for $39. These have pre-set markings on them, and I dialed the setting into 15 psi on the All-Top deflators and put them on my tires. After about 6 min, all four my tires were within one or two psi of my desired setting. They were either 16 psi or 17 psi. Having watched reviews about these I knew that you could calibrate them the same way as the Original Staun deflators. So I used my up down, air tire deflator that removes the valve core and I lowered one of the tires to 15 psi and calibrated both these and the set from Staun on the same 35 inch tire on my gladiator. The pressure gauge on the Up Down Air tire deflator, and my computer on my gladiator both said that the tire I used was Inflated to 15 psi. The calibration process was easy. I then aired up all four of my tires using the All-top compressor, which took just a little over eight minutes Using a four tire inflation system. Then I used the All-Top tire deflators to deflate the tires and it took about 6 1/2 minutes to get them from 38 psi down to 15 psi. I used my jeep gladiator computer to test tire pressures and three of the tires were 15 and one of them was 16. I’m pretty satisfied with that outcome. The Staun deflators took more than twice as long to deflate coming in at almost 15 minutes, I had inflated the tires to 38 psi after my test with the All-Top. And they only deflated down to 17 on three of the tires and 16 on one of the tires. So calibration process was not as accurate and the air down process took way longer. Overall the All-Top system was more accurate and faster then Staun. Plus this system comes with nice black metal caps for your valve stems.

I’m happy that I tested them before I went out trail riding. I set them to 20 psi which is the lowest you can set them. It never stopped deflating the tires. I noticed the tires were almost completely flat and removed them. Set them to 25 psi and they stopped at 17 psi. Disappointing but they are still usable. Just know that they don’t perform at the level they’re supposed to.

must have for off roading!! set your desired pressure, twist on and let it do its job. save you lots of time and makes it easy. definitely recommend for anyone that goes off-roading