Thermal Expansion Tank;Type Vertical, Free Standing;Applicable Standard ASME, NSF/ANSI 61, IS0 9001;Inlet/Outlet Connection 1-1/4" Female Threaded x 1-1/4" Female Threaded;Tank Material Red Oxide Primer Steel;Tank Inner Lining Polypropylene;Temperature Rating 200 Deg F;Pressure Rating 150 PSI;Tank Dimensions 24" Diameter x 37" Height;Tank Capacity 53 Gallon;Tank Warranty 1 Year;Diaphragm Type Heavy Duty Butyl;Air Charge Type Factory Pre Charged;Air Charge Capacity 55 PSI;Options Sight Glass;Inclusions/Features Schrader Air Valve with EPDM Seat, Seismic Restraint;Application Closed, Potable Water System