Neat idea, I have a "Go Gas" adapter that holds the piercable type gaz canisters and converts them to the screw thread type, currently the piercables seem to be cheap here in the UK, on a larger scale I have an adapter that converts 4.5 kg Calor Butane bottles to screw on Camping Gaz devices, which is also a significant saving, I have seen some interesting stuff made by Gaslow allowing filling from petrol station LPG nozzles, though currently only available as a build in system for campervans and the like.
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