I went insane trying to pump my Jet 90 HED with this adapter. However, I figured it out and it works perfectly.1. Make sure the Presta valve core is fully unscrewed. In fact, I tightened it a bit, so when unscrewing the adapter, no air came out.2. Make sure the Presta valve core fits into the adapter until you can screw it in properly.3. Put the pump on the other side of the adapter, attach and inflate.4. When the desired air pressure is reached, carefully remove the pump from the adapter. Carefully begin to unscrew the adapter from the valve. Since the core was a bit tight, no air should have come out. I hope you understand my instructions. The supplier must develop a visual guide so that everyone can successfully use this adapter. I like that I don't need another person. Be sure to try this process many times before going to the race.
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