Eastman Thermal Expansion Tank, 2.1 gal Nominal, 3/4 in MPT Connection, 150 psi Working, 210 deg F, Butyl Rubber Diaphragm, Steel, White, 12 In Height X 8 In Width, FDA Approved, IAMPO Listed, ANSI/NSF 61 Certified, For Used On Gas, Oil, or Electric, direct-fired, Residential Water Heater and Hot Water Storage Tank