LEFOOPressure Switch Control 90-125psi 4 Port Heavy Duty 26 Amp for Air Compressor LF10A-4H-1-NPT1/4-90-125

Work Great!

Original Review - Scroll Down for UpdatesI purchased this switch for an old Craftsman air compressor (mid-90's) with a made in the USA Campbell Hausfeld compressor. The switch that came with the compressor was cutting out at 135 PSI which is higher than I need and was taxing the compressor to get the last 10 lbs. Since the switch could not be adjusted I decided to replace it with a new switch that has a 125 PSI cutout.I was hesitant to buy the Lefoo switch considering an OEM replacement is close to $100. But I could not justify the cost for a used compressor that cost me only $200. After reading the reviews I decided to make the purchase knowing I could just return it if it was cheaply made or did not work.Ends up it's a pretty well made switch. Yes the cover is somewhat cheap plastic, but the inside mechanism seems solid. The four port manifold allows for a very flexible installation and made it easy to add a gauge, safety relieve valve and regulator assembly.My only complaint is; while it was cutting out at 125 PSI as designed, it was cutting in at 85 PSI instead of 90 PSI as advertised which is a bit too low for my needs. The instruction for how to adjust this are on the inside cover of the switch plus another reviewer explains it in the Questions section for this device. At any rate, I was able to adjust the switch to cut in at 95 PSI and still cut out at 125 PSI. Works perfectly now. So if I could rate it 4-1/2 stars I would, but given the price and quality of the switch, plus the fact it can be adjusted....well five stars is warranted IMO.Time will tell how long the switch will last, but based on the quality and feedback from other reviewers and how much I plan to use it, I suspect it will last a long time. If not, it's not a lot of money to spend versus $50 - $100 or more for some of the other supposedly "higher end" switches that did not even get as many positive reviews.Update June 17, 2022Everything seemed to work okay for a while but then the unloader (or so I thought) started to randomly malfunction so the compressor would hang trying to start under the load, which would trip the circuit breaker if it was left unattended. Of course it started to get worse and became a real problem when I was using the compressor for the project which I purchased it for in the first place - very frustrating. When it does reach the set pressure it shuts off and the unloader just leaks letting all the air out.At this point I am not sure if I should just try another one, or spend the money for one that cost three times as much. In the end I might have just gotten a defective switch since, like I noted in my original review, it is a well made switch. Either way I can no longer give it a five star rating since I am out the original money and can no longer return it, plus the time it took me to install it, plus the inconvenience I have had to deal with due to this faulty switch. So even if I do buy another one and take the chance, I cannot give this a high rating. Try at your own risk IMO.Update July 10th, 2022I did end up buying a second switch and installed it, but still had the problem I noted above. Well it appears the switch was not the issue. After some additional testing and research I found out the check valve was malfunctioning. I assumed it was not the check valve since I replaced that the same time I installed the first switch and since there is not much to a check valve, I ruled it out. I come to find out the leaking at the unloader is an indication the check valve is not functioning properly - which I should have known.Anyway, I removed the almost new check valve and cleaned it with brake cleaner and it still did not work. Just for the heck of it I tried this test; when I had the compressor up to operating pressure and it shut off, I removed the unloader line at the pressure switch and it continued to leak air from the check valve. But when I removed the unloader line at the check valve, it closed with a snap. So it appeared there was not enough air moving through the unloader line to allow the check valve to close and the unloader line was the original one that came with the compressor. This indicated to me the check valve was not the correct design for the type of unloader system the pressure switch had - which was the same as the original.Since I did not have any documentation for the air compressor and could not find anything definitive on the internet, I could only pick a check valve based on how it matched the configuration of the original so it would at least fit. But the test showed me it was not the correct one. I eventually decided to purchase a different type of check valve that uses springs and a diaphragm versus a ball and check type which was the style of the fist one I tried. Once I installed the new style check valve everything is working as it should.

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I was having a problem with my air compressor, leaking air. Located on the side of this Lefoo Pressure Switch Control, is a small metal tube, called an "unloader" valve. It has a small air line connected to it, that connects to the check valve on the air compressor's tank. That metal "unloader" valve tube, is about the size of a valve stem on a tire/wheel. An "unloader" valve is designed to release a little of the head pressure on the compressor motor after it shuts off. Otherwise, the motor would be trying to start under to much load. If the "unloader" valve is working properly, one will only hear a few seconds of hiss, right after the compressor motor shuts off.My compressor, started to continually release air, out of the "unloader valve." I thought the pressure switch was bad so I ordered this same model Lefoo Pressure Switch Control, that originally came on my air compressor. After installing it, the same problem was still there. My compressor, was still continually releasing air, out of the "unloader valve."I traced the small air line, from the "unloader" valve, to the check valve on the top of the tank. Upon removing the tank check valve, I discovered a small piece of rust debris, that was preventing the check valve from sealing shut. I was not aware that when the check valve doesn't seal properly, it leaks air through that small air line and out of the "unloader" valve. Needless to say, I did not need a new pressure switch. However, I was not about to un-install this new one that now works perfectly.I will add a few tips: Get yourself a little dish soap and a tooth brush. Put a little of the soap in a small cup of water and stir it up with the tooth brush. Pick up the suds on the tooth brush and apply it to the fittings that you are working on. It will show even a tiny air leak by making bubbles in the suds. There is one negative on this Lefoo Pressure Switch Control, that one can easily correct. There is a small on/off switch lever on the side of the control. It seems to work backwards. Down is on and Up is off. After installation, it is impossible to read any on/off markings for this confusing switch. I took my Brother label printer and made some large, professional, on/of indicators for it. Another item is the instructions to set the pressure switch to your desired on/off pressure settings. I had to go online to see better instructions on how to adjust the settings. Overall, this is a nice pressure switch for the price. I would purchase it again if needed.

Good product, fast shipping, works as intended, happy overall.