Standard:ce ul tuv. Material:sus 304, sus 316 polish:0.6um thickness:inner:4.0mm, jacket: 2.0mm pressure:test: 0.3mpa capacity in liters:200l, 3000l, 5000l, 1000l, 2000l, 3000l, 4000l, 5000l. Capacity in bbl:3bbl, 5bbl, 7bbl, 10bbl, 20bbl, 30bbl, 40bbl. Insulation:100mm polyurethane valves:carbonation stone, spray ball, sample, pressure, drain, release etc.