Bought this specifically for use with Roy Pow 180w AC/DC converter (200w max) 12v 15amp power supply (also purchased from Revain). The kit allows me to inflate my RV tires from a 120v source or a 12v source (I use my Kodiak portable solar generator for a 12v source). The amount of air to inflate is understandably small, but the psi rating to inflate RV tires (80-100psi) is what I was looking for in this unit. When I first got the device, I did a "break-in" on the pistons by running them unconnected to the tire (no pressure resistance). I've run the "on for 5 minutes, then off until cool" cycle about 5 times. So far so good, absolutely no problems. Knock on wood. Pretty good price, fast delivery.