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#10
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Let me the first: As long as an "assembly" not a "device" (which cannot be tested) is installed with proper clearance for testing and service (unions on both ends), I see no reason why a RP cannot be installed in a proper below-grade v.b., as long as a sump is installed to drain the relief, if it fails, which, if tested yearly, is highly unlikeable to fail, as the same for DCVAs. I really don't understand the flatlanders negative attitude towards below-grade backflow assemblies, unless they are too lazy to understand how to test/ winterize them.
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