WKK cylinder , one of the leading manufacturers of high-pressure cylinder type I, type II, type III. With high technique, we can offer cylinder as per your requirements. We are manufacturing following items. (1) CNG TYPE-1 cylinder seamless steel cylinder (2)CNG TYPE-2 cylinder welded cylinder, composite cylinder Standard: ISO11439 ISO9001 BV Material: 34CrMo4 /30CrMo, OD: 279mm/325mm/356mm/406mm (We can customize as your requirements) Water capacity: 40L 45L 50L 60L 70L 80L 90L 100L 110L 120L 130L etc.