Well, when it works they are good, but when they fail, good luck in getting any kind of support. I have tried calling suppliers and they say buy a new one. Tried calling Ingersol direct but no reply. So tried twitter and they say they will contact me. Ok a year has passed, I am a fairly patient person but this is stupid. Tried again and again they say someone will contact you, three months go by ans nothing! So if you are looking for a disposable one use unit, I would recommend Ingersol. If you want a good serviceable unit, this is NOT the brand to buy, as I am not sure they can even spell customer service.