I was looking for a better cartridge that would be easier to use. I've had a couple of screw-on ones, but they lose too much air when unscrewed from the valve stem. These cartridges work quite well. I have tried 3 machines so far, plus a lawn tractor. The chuck attaches easily with virtually no air leakage when pressed. Likewise, when the release lever is pressed, a very short stream of air is released from the tire. The only downside I've encountered so far is that it takes a bit of force to remove some valve stems from time to time, but that's not the case. Air leakage when this problem occurs. I would buy again if needed.