The regulator is made for one country's cylinders and pressure (help centre): UK 37 mbar push-fit; EU 30, 37 or 50 mbar; US and Canada screw-on; Australia left-hand thread. Gozney's Australian help centre adds that after a 2022 change to propane valves, new-style regulators need new-style bottles. Buy the right regulator locally, to EN 16129 in Europe.