Type:1 gallon Capacity: 4kg Weight:15kg material of out-barrel: iron material of In-barrel; stainless steel thick: 8mm high: 280mm Diameter:195mm range of pressure: 4-6kg Max fluid pressure: 8kg Type: 5 gallon capacity: 20kg weight:28kg material of out-barrel: ironthick:8mm high:360mm Diameter:270mm range of pressure:4-6kg Max fluid pressure:8kg Type: 12 gallon capacity:50kgweight: 60kg material of out-barrel: ironthick: 8mm high:560mm Diameter: 400mm range of pressure: 4-6kg Max fluid pressure:8kg