Water Heater Thermal Expansion Tank; Type Vertical, Diaphragm; Inlet/Outlet Connection 3/4 Inch Male Threaded; Tank Material Urethane Painted 16 Gauge Cold Rolled Steel; Tank Inner Lining Plastic; Temperature Rating 200 Deg F; Pressure Rating 150 PSI; Tank Dimensions 8 Inch Diameter x 11.6 Inch Height; Tank Capacity 2.1 Gallon; Tank Warranty 1 Year Limited; Diaphragm Type Butyl; Air Charge Type Adjustable Pre-Charged; Air Charge Capacity 40 PSIG; Inclusions/Features Brass Air Valve with Rubber O-Ring Seal, Stainless Steel Connection, Corrosion Resistance; Application Water Heating System; Applicable Standard UPC, ANSI/NSF 61/372, TUV; Lead-Free