Amtrol® EXTROL® 112-1 EX Series In-Line Hydronic Expansion Tank, 14 gal Capacity, 0.81 Acceptance, 11.3 gal Acceptance, 100 psig Pressure, Heavy Duty Butyl/EPDM Diaphragm, 15 in Dia x 21 in H

AM90 MFG #: EX90
  • Acceptance Capacity: 11.3 gal
  • Acceptance Factor: 0.81
  • Capacity: 14 gal
  • Country of Origin: US
  • Diameter: 15 in
  • Domestic/Import: Domestic
  • Finish: Urethane Topcoat
  • Height: 21 in
  • Manufacturer Name: Amtrol
  • Material: Steel Shell
  • Series: EX Series
Extrol® expansion tanks accept expanded fluid in closed-loop hydronic systems to control pressure build-up, improve comfort and help reduce energy costs. Nearly seven decades after inventing the first diaphragm expansion tank, Amtrol® line-up now includes specialty models engineered for modern, high-efficiency systems. None of it would have been possible without Extrol® The One That Started It All™.
  • Features and More


  • Strongest tank design featuring deep drawn steel and multi-dome construction
  • Projection welded air stem to help eliminate leaks
  • Patent-pending InSight™ service indicator cap
  • With 1/2 in MNPT System Connection


  • Closed hydronic heating boiler systems to control pressure build-up and suitable in propylene glycol


  • InSight™
  • IAPMO R and T Low-Lead
  • PHCC Association