Approved Vendor 60022 Thermal Expansion Tank, 2 gal Tank Capacity, Stainless Steel, 210°F Max. Op Temp G5262546 Deck Length 48 in Deck Length 48 in Approval Rating UL Expansion tanks for water heaters alleviate excess pressure caused by the normal thermal expansion that occurs when water is heated Sub brand Water Heater Expansion Tank Market Residential Product Type Thermal Expansion Tank Expansion Tank Type Diaphragm Tank Capacity 2 gal Tank Material Stainless Steel Connection Material Stainless Steel Diaphragm Material Butyl Rubber Outside Diameter 8 in Overall Height 15 in Connection Size 3 4 in Thread Type MIP Precharge Pressure 40 psi Max