Amtrol 141N43 Therm-X-Trol Thermal ST-12 Expansion Tank 4.4 Gallons

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The 141N43 from Amtrol is a Therm-X-Trol ST-12 Thermal Expansion Tank (4.4 gal volume). It's designed for use in domestic hot water heating systems to eliminate the potential hazards of water expansion. Water heater expansion tank is commonly installed in a domestic hot water system that contains a backflow preventer, a check valve or a pressure reducing valve.


  • Eliminates the waste of energy and water, thus saving money
  • Protects the water heater and plumbing fixtures from premauture failure
  • Reduces potential safety hazards associated with thermal expansion
  • Prevents a dangerous pressure build-up in the system
  • Prevents the relief valve from going off
  • Therm-X-Trol brand is the #1 choice of Professional Installers



Application: Plumbing
Tank Volume: 4.4 Gallons
Diameter: 11 inches
Height: 15 inches
Max Accept. Factor: 0.73
Max Pressure (PSI): 150
Temperature Range (F): 200°F MAX
Material: Steel
Connection Size: 3/4 inch
Weight: 9 lbs
Warranty: 5-Year Limited Warranty

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