2 Gallon Capacity, In Line Pressure Tank, Precharged Well System, Heavy Duty Steel Shell With High Gloss Enamel Finish, Bacteria Resistant Butyl Rubber Diaphragm With Seamless Construction For Uniform Strength, Polypropylene Liner and Copper Lined Acceptance Fitting Provide A Corrosion Resistant Water Reservoir and A Reliable Water Tight Seal, Meets FDA Requirements For Potable Water Supply.