stainless water tank : no distortion, no leakage, high tensile strength, easy to maintain and repair, cost saving, long ... to joint the panel flanges. The dipped galvanized serface of bolts, nut and washers are exposed externally and stainless steel ... .Internal: stainless 304.Characteristics:stainless, no distortion, no leakage, high tensile strength, easy to maintain and repair, cost saving, long-term ...