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)

Expectations and BackgroundI purchased the ALL-TOP Adjustable Auto-Stop Tire Deflator Valve Kit about a year ago to simplify the process of airing down my Jeep’s tires before heading off-road. My main goals were accuracy, speed, and convenience during off-road trips.Performance and ExperienceAfter several uses over the past year, I’ve been impressed by how well these deflators perform. They’re easy to set, air down quickly, and consistently bring all four tires to my desired PSI. The auto-stop feature removes the guesswork and allows me to prep for the trail more efficiently.Pros• Fast air-down times, saves valuable time at the trailhead• Accurate PSI settings make tire pressure uniform• Simple to set up and use, even for a beginner• Durable, withstood regular use over a year without issuesCons• No significant drawbacks encountered so farComparison to Product DescriptionThe product works exactly as described. It reliably airs down tires quickly and stops at the preset pressure, matching my expectations and the advertised features.TakeawayIf you’re looking for an easy, dependable way to air down tires for off-road driving, especially on vehicles like a Jeep, this kit is a great investment. It’s become a must-have in my trail gear.

These deflators worked just fine! They were exceptionally accurate. They all deflated the tires to within 1 psi of the target setting. They were all within 1/2 psi of each other. Allowing for setting tolerances & gauge tolerances, they all preformed well within their rated tolerance of 2 psi! Remember, these deflators are just designed to get you close to your desired pressure. If you are involved in some motorsport where tire pressure is critical, you need to fine tune your tires manually. But for a little off road or beach driving, just spin these on & you don't have to wait around for each tire to deflate.I think that where most people are having problems with these deflators is that they're reading the setting from the wrong location. You MUST read the setting from the top of the body, with the knurled locking ring backed way off out of the way!!! (See Picture) If you read from the top of the locking ring, you will set the deflators 8-10 psi LOWER than the desired pressure! The symptoms described by most of the people having problems with these deflators is consistent with reading the set pressure from the top of the locking ring instead of the top of the body.

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.

They work well and are much cheaper than the Staun brand deflators. A little tricky to get them set. you really need to test them before fully trusting the setting you choose

These are great. Not exacting, but close in psi. Deflate while doing other prep.

I wasn’t sure these would be accurate enough. Especially when compared to the $100 set. But these have been spot on after taking the the time to adjusted them. I take my tires down to 15lb for off-road. These work well when set where I can barely see 15 on the scale. Also you need to wait until they completely stop. All four 31 tires take about 4 minutes or less. When I get back around to the fourth deflator it’s almost down. These are a little more expense than the cheapest ones but save yourself a headache work these.

Overshoots your desired pressure so you need to verify pressures by another means and make sure you have a pump.

Tested in 5psi increments against a Longacre gauge. Once you figure out where to look at the intended pressure on the deflator body, these are spot on. They are not super fast, but you can speed them up a bit by pulling on the plunger. 35x11.5R17 tires were used as the test bed. Dropping from 30psi to 15psi, I went tire to tire putting on the deflator. When I got back to the first, it was still letting air out. A little pull on the plunger and it finished up. Once the set pressure it reached,the flow stops quickly.