oxygen cylinders 1)standard GB ASTM API 2)capacity:1-12m3 3)pressure 1-120bar oxygen cylinders 1)standard GB ASTM API2)capacity:1-12m33)pressure 1-120bar we can supply seamless air bottle,weld air bottle,Steel cylinders ,Composite air bottle,Aluminum alloy air bottle etc,if you have any requirement ,don't hesitate and contact me oxygen cylinders