CNG cylinder Type 1: OD: 232/279/325/356/406mm Water Capacity: 20- ... exporting gas cylinders and its related products,such as CNG cylinders (Type 1 & Type 2),CNG Kits, seamless steel gas cylinders,high purity gas ... all the customers around the world. The main sizes for CNG Cylinder Type 1 FOR VEHICLE are: OD232mm: 20,22,24,27.5 ...