I just made a hose and fittings to go from 9kg to the smaller ones with different fittings used on little camp cookers/gas lights etc.
If you have some old shit laying around it's just a bit of hose and some hose clamps.
I freeze the empty the connect up and fill till cant hear much flow.
In the name of science I have filled frozen container to full then watched it releive via safety valve...
If you should over full just open main valve in an open clear safe area and vent till liquid stops.
I'd recommend doing the last one with any canister home filled.
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