Check with a local plumber or with ... your backflow preventer is near the main shutoff valve for your home. For a homeowner, the sewer backflow preventer usually will be above the ground, so ...
The Family Handyman on MSN1y
How To Install a Floor Drain Backflow PreventerA big pipe carries waste from your house to the main sewer line under the street. If either becomes plugged or overloaded, ...
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