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the vacuum hose I believe just supplies the force needed to close the valve if the solenoid is operated via "LO" setting on AC. there is always hot water flowing through the valve. the sealing on the housing of the valve will fail. I even had one valve fail in the plastic pipe part itself. just blew out the side of the plastic piping not the sealed locations. if yours never failed then you are very blessed!!
posted by 208.67.16...
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