Amtrol® Therm-X-Trol® 140N43 ST Series In-Line Thermal Expansion Tank, 2 gal Tank, 0.9 gal Acceptance, 150 psig Pressure, 8 in Dia x 13 in H

  • Acceptance Volume: 0.9 gal
  • ASME Yes/No: No
  • Connection Size: 3/4 in
  • Connection Type: MNPT
  • Country of Origin: US
  • Diameter: 8 in
  • Domestic/Import: Domestic
  • Finish: Urethane Topcoat
  • Height: 13 in
  • Manufacturer Name: Amtrol
  • Maximum Temperature: 200 deg F
  • Pre-Pressure Rating: 50 psig
  • Series: ST Series
  • Tank Volume: 2 gal
Amtrol® invented the thermal expansion tank to absorb expanded water in closed, hot water systems and protect the water heater. Since the beginning, we've kept the pressure on our competitors with features they just can't match; like our patented Turbulator™, antimicrobial liner, patent-pending InSight™ service indicator cap and 50 PSIG precharge. When your water heater is on the line, we deliver.
  • Features and More


  • Antimicrobial liner neutralizes bacteria on contact
  • Patented Turbulator™ water circulation device
  • InSight™ indicator cap tank service alert
  • Strongest tank design featuring deep drawn steel and multi-dome construction
  • Thickest diaphragm - heavy duty butyl
  • Projection welded air stem to help eliminate leaks
  • Exclusive ST-1 for tankless water heaters


  • For Use With Closed
  • Potable Hot Water Systems to Control Pressure Build-Up and Protect the Water Heater


  • IAPMO R and T Low Lead Compliant
  • ANSI/NSF 61
  • PHCC Association


  • 5 Years Limited