Originally Posted by jambo
That's why I had to use the ones I linked you don't need too touch the valves
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But don't you still have to manually open or close the valves?
I can't see any mechanism on the one linked to, which would turn the knurled centre to open or close the valve - unless you inflate against the closed valve from the start? It looks identical to the ones I use except I had a variety of washer thicknesses to get a good seal.
In any event, if the OP is getting air escaping it would be between the adaptor and the valve. Once the adaptor is securely linked and sealed to the valve there can't be any way of air escaping other than through the hose or the pump, imho.
Sorry, followed the OP link to the adaptor. I see how the white adaptor in your link opens the valve, but that still doesn't explain the air loss during inflation. It would make the process a lot easier though!