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OK, thanks for the tip!MHB said:Yep. The American bottles have a 0.83" 14 TPI thread and Australian bottles have 0.86" Whitworth parallel thread (also 14TPI but a different form).
You can sort of fit an Australian reg onto a US bottle, but its a bit dodgy - see comments above - not the other way around. If you do a bit of digging you might be able to find an Australian type 30 nut and just change that rather then the whole regulator.
Look for a Soda Stream Adaptor, they aren't hard to find and will do the job .