Refillable RV/LPG gas bottle dust cap
thingiverse
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/05SgcTHB2ID Bought a couple of RV/LPG (UK) refillable gas bottles but couldn't find a dust cap for the filler valve. I found it easier to make than search. I used PLA, with supports and added a piece of foam inside to make it hold in place.
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