... 2) Outside diameter: 159-279mm 3) Water capacity: 20-90L 4)Standard:GB5099,ISO9809 About Us | Tianen Your Position: >> About Us ... and manufacturing various kinds of high pressure gas cylinders, which including CNG cylinder for vehicle, seamless steel cylinders, Fire-fighting cylinders, Fully wrapped ... for transportion , fire-fighting, medical treatment, industry and so on. Seamless Steel Gas Cylinder