Amtrol extrol boiler system expansion tank ex-30, 4.4 gallons the extrol ex-30 expansion tank is pre-pressurized and features a diaphragm design. For use in closed, non-potable, hydronic heating systems. Accepts expanded water as system temperature rises to reduce pressure build-up. Helps reduce energy consumption and reduces system wear. features: factory pre-charge: 12 psig maximum working pressure: 100 psi maximum operating temperature: 240 degree f water tight reservoir for expanded water
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