We manufacture all valves using certified CW 617 N pressed brass. The valves are precision cut using the latest CNC technologies and then protected with nickel and chrome platings, and then assembled and quality controlled with special calibration equipment by our expert staff. The valves are CE EN250 and PED CE 97/23 approved and come with all necessary declarations. All the valves include seals and are assembled compatible oxygen lubricants. The valves connect to the tank with 3/4NPSM fittings and exit with the INT or DIN/INT system. All Sub 3/4npsm valves are DOT (4500-5000-5500 PSI) approved.