Water Heater Expansion Tank; Type 2-Piece; Inlet/Outlet Connection 3/4 Inch Male Threaded x 3/4 Inch Male Threaded; Tank Inner Lining Plastic; Temperature Rating 180 Deg F; Pressure Rating 150 PSIG; Tank Dimensions 8-1/4 Inch Diameter x 10-3/16 Inch Height; Tank Capacity 2.1 Gallon; Tank Warranty 1 Year Limited; Air Charge Type Field Adjustable; Air Charge Capacity 38 PSI; Application Potable Water Heating System; Applicable Standard NSF/ANSI 61G, UPC; Lead-Free; Maximum Acceptance Volume 1.03 at 60 PSI