we are special manufacturer of oxygen regulator in China, it has often export out abroad, some information is as follows: American style aluminum oxygen regulator It adopts built-in safety valve for exhaust .The pressure-reducing mechanism adopts piston spring pressure-reducing structure .and is disposed longitudinally to make the structure more compact .Fashionable anodized surface treatment ,12 levels in adjustment. Output pressure: 50PSL Output flow(can be selected): 0—4L/min 0—8L/min 0—15L/min 0—25L/min