This item meets industry MILSPEC standards and works perfectly! I admit it's a bit pricey but so far I've been through 3 of its competitors and all 3 are in a junkyard now. If I had bought this first one I would have been about $10 ahead and not had so many blood pressure spikes! Work. Having a pretty pathetic history of accessing motorcycle valve stems, I have angled valve stems on all my bikes. This negated the importance of the angled chuck that came with this pump, but for those still struggling to find their way through dual disc brakes and spokes, the angled chuck will likely put a smile on your face.