5 gallon capacity, inline, pressure pump tank, designed to meet the requirements of & are listed by the national sanitation foundation nsf under ansi /nsf std 61, the butyl diaphragm has seamless construction & is designed to flex rather than stretch & crease like bladder tanks, the polypropylene liner for the water reservoir will not flake, chip, crack or peel & does not impart taste & odor to the water, diaphragm, liner isolate water from contact with deep drawn steel domed shell, twice as strong as rolled steel shell of same thickness, a high gloss enamel finish protects tank from the elements, pre-charged to 25 psi, usable water drawdown @ 30-50 psi 1.4 us gallons, 3/4" male pipe thread connection.