Amtrol® 102-1 EXTROL® EX Series Boiler System Expansion Tank, 4.4 gal

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%