Air Compressor Pressure Switch for Pneumatic Tools, 90–120PSI Adjustable Controller

So far good. Purchased this for an old 20gal 125psi max compressor that had a faulty pressure switch and no longer switched off when it reached the desired pressure. Doesn't come with any instructions, but does have a wiring diagram on the inside of the cap. Ended up not using the smaller air valve, hose connector and pressure relief valve as they were of much lower quality compared to what I already had. Between the new part and my old part, I had enough parts to make the repair. This kit doesn't come with any thread tape, so have that purchased ahead of time and ready, you will need it on ALL threads. Doing this, I had ZERO leaks.

Good replacement on my portable air compressor.

Part quality a little on the thin side.

Works like new

A couple of things stand out with this product. First, there are no instructions of any kind. It is pretty obvious how to put it together though since there are lots of pictures on the item listing on Amazon. There is also no teflon tape for the fittings. I prefer to use a PTFE paste sealant anyway, and it is likely that if you are purchasing this item you already have thread sealant of some kind (like teflon tape). More concerning to me was some of the dimensions. When installing the tank pressure gage there isn't enough room between the back of the tightened gage and the plastic cover over the switch contacts. I suggest you use a 1/4" close nipple and 1/4" coupling so that the gage can be tight and not hit the case. I had a similar issue with the drain valve and opted for a plug instead. The pressure relief can serve as a drain. If you want the drain valve, be sure to screw it into the regulator block BEFORE you attach the regulator since there isn't enough room to swing the valve otherwise. The regulator is also too close to the sensing air line fitting, requiring that the regulator be mounted at an angle, or get a longer 1/4" pipe nipple. I am pretty sure if you leave clearance for the gage, regulator, and drain valve they will leak air. Sufficient tightening brings them too close to other parts of the assembly. Another concern was the answer the vendor supplied in response to the question on the listing "Can this be used on 120v?" to which the vendor said "No." I disagree and don't see any reason why not. The device is an air pressure actuated switch and while it is rated for 240vac, there is no reason that you can't use the same contacts to switch lower voltage. It is OK to switch both the "hot" and "neutral" on a single phase as long as both are opened at once (as they would be with the DPST contactor in this unit. Given that the cord on your compressor could potentially have an unpolarized plug, it is probably safest to connect both wires to their respective switch contacts anyway.

Please don't waste your money on this one, let me explain. I suppose somewhat my fault for trying to save a couple of bucks. This thing is not worth the postage that it took to get here. Got it installed and wired, filled up my tank and I could hear a hissing. Tracked it down to a gauge and tightened it. It was still hissing. Tightened it down some more, still hissing. Turns out the gauge had an internal leak making it useless. Not the end of the world I had another gauge so NBD. Upon tracking down another leak, it was the regulator. The entire regulator body was cracked. Now this isn't my first rodeo with these types of things, but the regulator body was as cheaply made as it could possibly be, and I suspect it cracked during installation.. So let's assume that's my fault but next on the list is the unloader valve. It does not function properly. One flaw, I can overcome but three on the same job? I don't think so. As I'm typing this, I hear the pressure relief valve leaking as well. I even have another one of those but by this point what did I actually buy?

well constructed, arrived early

Excelente producto, se lo instalé a un viejo compresor y le funcionó a la perfección, olvidé tomar fotos. Lo recomiendo