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This service valve links the expansion tank to the system or to the service center (#HGSC-MULTI) and allows you to isolate the expansion tank from the system pressure. While the tank is shut-off from the system pressure, you can inspect it (verify pressure) or remove it for replacement without having to drain the system. Once this operation is over, re-open the valve and the system will get back to normal operation.
Calefactio HGSV12 Heating Service Valve, 1/2 in, MNPT x FNPT