... is a Professional Manufacturer of Seamless Steel gas cylinders, CNG-1 cylinder in Zhejiang, China .Zhejiang Tianen CNG cylinders :The ... specification of our CNG cylinder of Type-1 as following :Production standard : ISO11439 ,GB17258.Working Pressure :20Mpa , ... , 70L ,75L, 80L,85L,90L ,95L,100L ,110L,113L,120L,130L,150L.Out Diameter :232MM, 325MM, 356MM ,279MM,406MM .Wall thickness ...