A.O. Smith TW-5-1 Expansion Tank prevents wasting water and provides a smooth operating system for plumbing systems where backflow or check valves are present. When a backflow protection seals off your water system, it requires the use of an expansion tank, otherwise the relief valve can be discharged on every heating cycle. The expansion tank will be internally lined with a polypropylene liner for corrosion protection and its air valve will adjust the air pre-pressure to the actual water pressure. Basically, the expansion tank can add years to life of your water heater.

  • Stainless steel acceptance fitting
  • Polypropylene liner to eliminate internal corrosion
  • External baked epoxy-polyester coating
  • Two-piece design
  • Butyl rubber diaphragm to separate air and water
  • Deep drawn steel
  • No wasted water
  • Max water pressure: 150 PSI
  • Max temperature: 200 ̊F
  • Tank volume: 2.1 Gal
  • Max acceptance volume: 1.03 PSI
  • Conn. size: ¾ NPT
  • Dimensions (D x H): 7.9” x 11”
  • Weight: 4.5 lbs
  • Heater size: up to 52 gal