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Changed mixing valve now backflow is leaking

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dfehr401
dfehr401 Member Posts: 9
in Domestic Hot Water
I replaced the mixing valve, the old one had calcium build up. I replaced with a new mixing valve that has check valves on both hot and cold sides. I notice there is a drip from bfp drain. Any idea how i can fix this? You guys think some calcium made it up to the bfp when took old mixing valve out?

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