Hi dear!brWe are a professional manufacturer of gas cylinders and accessories.>br1.We produce different standard cylinders for different countries.>brNorth American countries use DOT standard> EU countries use EN-ISO standard other countries use ISO9809 standard.,brWe produce many different sizes of cylinders> from 2L-80L.br<2. We produce many different products such as oxygen regulator, oxygen concentrator gas generator, gas cylinder valve gas cylinder cap. Packing machine, filling machine packaging machine supporting products.,br3. We have 15 stores on Alibaba> we are the No.1 gas cylinder and packing machine filling machine supplier in Alibaba.