If you're selling a Schraeder Presta adapter, the Schraeder side needs a pin/plunger - something there to actuate the center pin of the standard gauge head. I see other reviewers using it with a pressure gauge but I can't get it to work. Drilling doesn't change the situation. So now buy a blowgun designed for this adapter and live without being able to measure what you put in as air without going back and forth with a pressure gauge (another problem). I've spent hours and many dollars trying to fix this issue as local bike shops don't have a low range gauge for Presta). Just make sure the tires are properly inflated. TO HATE. PRESTA. (and this thing doesn't really help much, almost $20.) UGH.UPDATE 04-04-21 BROKEN! Don't waste your time and money like me. Have used it a maximum of 12 times. Not designed for normal use. The aluminum is about .016" thick at the threaded rod, allowing it to fold in half with very little effort. I still hate presta and now this POS.
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