Approved Vendor 60022 Thermal Expansion Tank, 2 gal Tank Capacity, Stainless Steel, 210°F Max. Op Temp 82230 Finish : Manganese Phosphate Finish : Manganese Phosphate CAT Safety Rating CAT IV 1000V These tanks absorb excess pressure caused by thermal expansion in closed plumbing systems 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