Eastman 60023 Thermal Expansion Tanks, 4.5 gal/16'' x 11.1'' x 10.9'', White by Eastman at Historic Charles Street. MPN: 60023. Hurry! Limited time offer. Offer valid only while supplies last. This Thermal Expansion Tank prevents hot water from back flowing into the cold water line. This tank also prevents hot water from escaping through the pressure relief valve and onto the floor. The thermal expansion tank prevents constant fluctuations in water pressure that damage the heater.4.5 Gallon tank. 3/4'' MIP connection. Factory pre-charged at 40 PSI. 305 Stainless steel fittings. Butyl rubber diaphragm.
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