... 40L 4.WP: 15MPa/150bar TP: 25MPa/250bar carbon dioxide co2 cylinder Outside diameterCapacityGas capacity DesignLength WeightWPTPMaterialStandardMMV(L)(M3 ... carbon dioxide co2 cylinder are all made of high quality steel, and are supposed to be used repeatedly for ... keeping permanent gases, such as oxygen, hydrogen, argon, krypton, nitrogen; and high-pressure liquefied gases, such as carbon dioxide ...