A.O. Smith 4.6-Gallon Expansion Pressure Tank

Expansion tank for heater overflow works on heaters up to 80 gallon Powder coated interior shell protects against corrosion, assures long trouble free life Exterior powder coat paint for long life and anti-corrosion, certified to automotive ASTM standards Proper tank sizing is critical to the performance of your water heater NSF and IAPMO approved If your home was built in 1985 or is newer, you should use an expansion tank There is a check valve on your meter closing the system and creating negative thermal expansion impact