Amtrol® EXTROL® Boiler System Expansion Tank, Vertical Floor-Standing, Series: SX Series, 32 gal, 15 in Dia, 48 in Height, 100 psi, Acceptance Factor: 0.35, 11.3 gal Acceptance Capacity, 240 deg F, Heavy Duty Butyl/EPDM Diaphragm, Steel Shell, Urethane Topcoat, Domestic