CNG cylinder of Type 1 ,seamless tube cylinder. ISO11439:2000 SYP cng cylinder is strict product in according to ISO11439:2000 and DOT ... 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 ... from 60L , 70L, 80L, 90L, 100L, 110L, 120L 130L. 140L CNG cylinder type 1