Ingersoll Rand ARO R37121-600-VS 1/4" NPT Air Regulator with Gauge

This may well be the best regulator I've seen. If I have one complaint, it's that the gauge seems small. That's no surprise, though. It's integrated into the regulator, and the whole block is rather small. Even so, it's a small complaint. Everything is well-marked and legible, and I am most impressed with everything else about it. I use a 30-gallon, oil-lubricated automotive compressor to run an airbrush. This is probably overkill, but for 5 minutes of noise, I get 2-3 hours of quiet work time. Unfortunately, my compressor has been eating regulators at the rate of one a year, though the last one only lasted 2 months. They work fine at 40 lbs, and may even work well at higher pressures. But sooner or later, when I run the pressure up to 80 or 90 lbs to fill a tire, the thing fails. As you may know, a regulator usually costs $20 to $60. It's a bother. The regulators I've bought at the Big Box stores seem really cheap. Their performance has been lackluster with several pounds of pressure loss when I actually start spraying. I've had replacement regulators fail right out of the package, too. Not good! With respect to most of the actual failures, I've since learned that it is extremely important to raise and lower the pressure slowly - more slowly than I've been doing it. Raising and lowering the pressure too quickly puts undue stress on the springs and seals. But the pressure and quality issues are still a bother, and I still needed a new regulator. So, I chose this one because I-R is a respected brand, this looked well-made, and the price was right. I'm happy to report that this is an outstanding piece of hardware, and apparently bargain priced. Other sites want $40 to $50 for the same unit. First, this has a very handsome, modular design. Second, all the parts seem well-made and fit together nicely. To adjust the inner range band, you do need to carefully remove the front housing, It snaps off and reveals the gauge assembly. Then, you move the yellow arrows as desired to set your pressure range. You pop the housing back into place and all is good. If you want the pressure knob on top, you remove the housing, remove a couple screws, carefully turn the gauge assembly 180 degrees, replace the screws, and replace the housing. Done! Once installed, I found the regulator has very little pressure drift - maybe a pound or two. Very Happy! Visiting the I-R site, I found that the company recommends putting a dirt & water filter between the air source and the regulator. No stock consumer compressor I've seen has this, and I've noticed buildup of contaminants in a couple of my worn regulators. So, this seems prudent and I will soon install a good filter unit to better protect my regulator. I recommend this as a very good, bargain-priced replacement regulator. I expect this to perform better and last longer than any other regulator I've tried. I will try to post updates over time. Thanks for reading.

High quality build and materials. Quality trusted brand. Feels very sturdy. Good size for a small semi-portable compressor. Combined with the matching water separator, it will make a great combination. Adjustment is smooth and the locking mechanism feels positive. My only complaint would be that the gauge is tiny. You'll need good eyesight, but I like how compact and protected it is, making it less vulnerable to damage if the compressor tips over in the truck bed. Follow Up After Installing: This is the best regulator I have ever owned on a compressor. Hands down. It is compact but very well made. The adjustment is smooth and easy to dial in to whatever pressure you want, from max pressure right down to 0 and all points in between. Very smooth and controlled, lets you be very precise. Maintains a consistent pressure wherever you set it. Fantastic! For the price and quality, it's a bargain.

This is a small and light weight air regulator with 1/4 NPT fittings. I'm using it on my home garage compressor (150PSI Max 5.4CFM @90 from HF). It seems to be holding up and doing it's job. I use the setup probably once to twice a week. It is hooked with a filter, T fitting (for full pressure feed to cleaning hose) and NPT quick conects. This is not the type of unit that you want to be mounting to the wall (although you could) expecting heavy use out of. So far so good. I figured for the price I could give it a shot. Also using the Matching filter.. it works as well. Four stars because it is very 'light duty' and feels like I could break it without a lot of effort. This is being use with Air Tools like impact wrenches, rachets and grinders. Could feel a little more solid.

I installed this regulator on a Rol Air JC10 after the factory regulator broke. It is quite simple and just has an in and an out port that fits 1/4" NPT connections. The built in gage works just fine, but is a hair on the small side. Being that the unit is compact, there isn't much way around that though. You can switch so that the adjusting knob is on top by switching the gage to the other side and flipping it over. It just requires removing a few screws. The adjusting knob clicks in and out to lock and unlock. The gage has an upper and lower yellow band that you can set to the desired value. This can help so you don't have to get close enough to read the small numbers. I would buy it again. It feels solid and works great.

I like this because of: 1. Performance. In particular ability to deliver volume with less pressure drop than the 4 other regulators I tested. With the tank pressure set at 100PSI, I observed the output pressure drop as it delivered air to an air blower with the regulator set at 80 and then 60. The pressure drop with this relatively high flow was between 1/3 and 1/2 that of four other regulators I had available. One on a Porter Cable compressor, one on a Rolair compressor, a cheapo Harbor Freight unit, and another one I had lying around of unknown origin. I couldn't find published curves for this regulator (or any other small regulator for that matter), but it seems much better than the others I have. 2. Configurability. It's a handy feature to be able to configure it any way round. The gauge comes off and can be attached on either side, either way up, so left to right flow, or right to left flow with the knob top or bottom are all possible. 3. Build quality. Seems good.

smaller then i had thought but still gets the job done and operates as it should. good little unit. never had a problem with this little guy.

I needed to try to keep the cost of the air regulator down but also I wanted it to match the brand of rhe other filters I purchased. The other reviewers were very accurate in saying that this regular is very small and some may find it difficult seeing the numbers on the gauge. I painted a couple lines with white out on the outside of it where the 80 and 100 psi marks are so theyd be easier to reference from a distance. Is it worth the money, yes as other larger regulators are almost twice as much....should I have ponied up the extra money to purchase a larger regular and dial, probably Yes. However it seems very accurate and adjusts the pressure quite easily so Im not disappointed and definitely recommend this to anyone that doesnt need to keep adjusting a regulator up and down and dont want to spend a lot of money.

Excellent little pressure regulator. After many years of putting up with the terrible, leaky Craftsman regulator that came with the compressor I finally bought this little gem. Wish I'd have done it years ago. The display is a bit small but it's not a big deal as in normal use it just gets set once for any given job and left. It's not like I have to be able to read it from across the room. I did a lot of reading and comparisons with the others available online and I finally convinced myself that the cheapest price wasn't the most important factor, especially after reading stories of the cheaper ones splitting open when over-tightened. This little guy installed quickly, easily, and it's incredible how smoothly/easily the adjustment is. 5-stars on this one!

What a difference from the stock cheapo regulator that came with my compressor. With cheapo regulator set pressure to 90psi, connected my impact wrench, almost 15psi drop in pressure. Installed this new ARO regulator from Ingersoll Rand. same setup, my impact wrench pressure set on regulator to 90psi, ran wrench, barely 5psi drop in pressure!! what a difference. Now the impact wrench runs really well. No leaks or other issues, just a great quality product. Highly recommend this unit.

Lo tengo en uso para un tanque de sandblaster…perfecto.

I bought this to put in series with an IR pressure regulator, but my air tape is on the right corner of a wall! These units needs air coming in from the left. It was so bloody easy to just take the face plates off and turn it around to accept air from the right side! Love this.

So far so good. Very accurate and reliable. I'm using it for a plasma cutter setup and wanted something that will last and not leak (has a chap regulator before that lasted for a bout a year) The dial could be a bit bigger. Otherwise all good.

Nice little regulator. Perfect for my needs. No leaks. Easy to adjust min and max in gauge. Wish it came with a mounting bracket.