As an aside, we have a great floor pump that had one side for Shrader valves and the other side for Presta valves. Well it worked terribly for my Presta valves on my bike, so instead of purchasing an entire new pump, the bike shop sold us just the end piece with hose and it is a one size fits all (both types of valves) and it goes on great. It's not a screw on type, but a clamp type. Problem solved.