Thermal Expansion Tank;Type Vertical, Free Standing;Applicable Standard NSF/ANSI 61, IS0 9001;Inlet/Outlet Connection 3/4" Female Threaded x 3/4" Female Threaded;Tank Material Urethane Topcoat Steel;Tank Inner Lining Antimicrobial;Temperature Rating 150 Deg F;Pressure Rating 150 PSI;Tank Dimensions 15" Diameter x 32" Height;Tank Capacity 20 Gallon;Tank Warranty 1 Year;Diaphragm Type Heavy Duty Butyl;Air Charge Type Factory Pre Charged;Air Charge Capacity 55 PSI;Inclusions/Features Projection Welded Air Valve;Application Large Residential, Light Commercial, Closed, Potable Water System