Regulator won't fit

The regulator will not fit my cylinder

Each regulator suits one country's cylinders and pressure: UK 37 mbar click-fit (PM2138), Germany 50 mbar screw-fit (PD1706), US and Canada screw-fit (PD1281). Buy Gozney's set for your country (the manual: "shall be that specified by Gozney"). For Belgium, the Netherlands and France, Gozney lists no Arc set: ask Gozney.