Asbestos-free acetylene cylinder is an international advanced product independently-researched. Deep drawn by one steel plate with advanced teachnology, asbestos-free acetylene gas, lightweight, work-of-art appearance. 1) Outside diameter: 158/160/209.6/310/304.8/209.6/254mm 2) Water capacity: 6.3-53.8L 3)Standard:GB11638,DOT-8AL,ISO3807-1