Hydronic Expansion Tank;Type Vertical, In-Line;Applicable Standard IS0 9001;Inlet/Outlet Connection 1/2" Male Threaded x 1/2" Male Threaded;Tank Material Urethane Topcoat Steel;Temperature Rating 240 Deg F;Pressure Rating 100 PSI;Tank Dimensions 15" Diameter x 21" Height;Tank Capacity 14 Gallon;Tank Warranty 7 Year;Diaphragm Type Heavy Duty Butyl/EPDM;Air Charge Type Factory Pre Charged;Air Charge Capacity 12 PSI;Inclusions/Features Projection Welded Air Valve, Watertight Reservoir for Expanded Water, Projection-Welded Air Stem Maintains Precharge Setting;Application Closed, Non-Potable, Hydronic Heating System