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The MACOMB GROUP 390748 ST-12 is a Therm-X-Trol® thermal expansion tank with a 4.4 GAL capacity. Constructed of steel with a urethane topcoat finish, it is designed for in-line use. It can handle a maximum pressure of 150 PSIG and has a 3/4 IN MNPT connection size. It measures 11 IN in length, 11 IN in width, and 15 IN in height.
The MACOMB GROUP 390748 thermal expansion tank accepts expanded water as system temperature rises and returns hot water to the system when demand occurs.
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