ISO11439, BV certificate. High pressure cylinder for the on-board storage of compreessed Natural Gas as a fuel vehicles(CNG).Meterial34CroMo4, OUTER DIA:232mm&356mm, WorkinTestpressure:20Mpa/30Mpa, Water capacity 20L, 25.5L, 28L, 34L, 57L, 70L, 77L, 113L.Design wall thickness:5.5&8.2mm.Neck...