Pump Sack adapter for drybags to 22mm vents
thingiverse
Adapter to glue from the inside of a regular drybag to use as a pump sack. Cut a small hole though the dry bag at a suitable location. Put super glue on the flange of the adapter and glue this from the inside of the bag. For air mattresses with a venting / filling hole that is 22mm in diameter.
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