Amtrol® EXTROL® 102-1 EX Series Boiler System Expansion Tank, 4.4 gal Capacity, 0.57 Acceptance, 2.5 gal Acceptance, 100 psig Pressure, Heavy Duty Butyl/EPDM Diaphragm, 11 in Dia x 15 in H

AM30 MFG #: EX30
  • Acceptance Capacity: 2.5 gal
  • Acceptance Factor: 0.57
  • Capacity: 4.4 gal
  • Diameter: 11 in
  • Finish: Urethane Topcoat
  • Height: 15 in
  • Manufacturer Name: Amtrol
  • Material: Steel Shell
  • Series: EX Series
Amtrol® designed and patented the first Extrol diaphragm expansion tank in 1954 to control system pressure and help reduce energy consumption in heating and chilled water systems. Over six decades later, Extrol is still the world's leading expansion tank brand, setting the standard for quality, reliability and innovation. All Extrol tanks are made in the USA at our ISO registered facilities by American workers dedicated to producing the highest quality expansion tanks in the world.
  • Features and More


  • Water-tight reservoir for expanded water
  • Thick, heavy duty Butyl/EPDM diaphragm for long service life
  • Sealed air cushion-factory precharged and 100% tested
  • 12 psig factory precharge
  • Strong, deep-drawn steel tank
  • Projection welded air stem maintains precharge setting
  • 1/2 in NPTM system connection
  • Accepts expanded water as system temperature rises to reduce pressure build-up
  • Helps reduce energy consumption and reduces system wear
  • Fill-Trol® models eliminate the need for a separate automatic fill valve and tank pressure controls system fill
  • Suitable in propylene glycol applications with mixtures up to 50%


  • Closed Non-Potable Hydronic Heating Systems


  • 5 Years Limited