... .All the cylinder is Pass finish the type test and choose the 34CrMo4 seamless steel tube for Type 1 and Type 2 CNG cylinderTill now SYP ... can offer to our customer the full serice CNG cylinder product as followingType 1 steel CNG cylinderType 2 ... from 60L , 70L, 80L, 90L, 100L, 110L, 120L 130L. 140L CNG cylinder type 1