So used about a dozen times since purchase. The first thing that happens is that the bypass fitting on the high pressure side is no longer pressing on the valve stem and therefore cannot pressurize the pressure gauge. This means the entire hose and fitting will need to be replaced as it is one piece. Second, the high side handle (knob) broke in half. I had to replace it with a temporary grip from an old pair of grips. Just a note to potential buyers.