Kitesurfing pump nozzle valve adapter tip
thingiverse
The valve in my kite's bladder is so tight and deep that no standard pump nozzle could open it and inflate easily. This nozzle does the trick. The nozzle diameter is 8.1-10mm. The usable length is approx. 38mm. It fits my pump connector perfectly. However, You might need to scale it to fit yours.
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