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Can you guys ID this for me?


cbass
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Yes, it's a backflow preventer/check valve. It's not too common if this is a single family residence. I usually find them in commercial buildings, multi-family and LARGE homes, all with fire suppression sprinkler systems.

It has test cocks for annual testing, required by the manufacturer, if not local code. I don't see a relief port so vertical installation might not be an issue. There should be a strainer if there is no filter preceding it.

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