... Outer tank diameter420mm,460mm,470mm,480mmInner tank materialSUS304-2B, thickness1.0-2.0mm. Water purity for drinking.Outer tank materialColoured plate,galvanized steel, stainless steel(optional ... ).Insulation layerPolyurethane foam, thickness:50mm,55mm,60mm(optional).Frame/bracketGalvanized steel ...