CNG cylinder of Type 1 ,seamless tube cylinder. ISO11439:2000 SYP cng cylinder is strict product in according to ISO11439:2000 and DOT ... before we ship to our customer .All the cylinder is Pass finish the type test and choose the 34CrMo4 seamless steel tube ... 60L , 70L, 80L, 90L, 100L, 110L, 120L 130L. 140L CNG cylinder type 1