I have had to use this little tool twice now. The first was with a longer-stemmed Presta valve. The inflator tool, contrary to the seller's statement, does NOT screw down securely on a Presta valve. But, with a longer valve, I was able to get the tool down firmly on the valve, and inflate my rescue tube, enough to get home. (The pressure claimed reachable on a 700x23 tire is inaccurate. I got probably 70-80, and normally inflate to 100.)The second time I had to use this tool, however, was with aSee full review