Backwater Valves

Backwater Valves
1. Install a backwater valve to protect fixtures whose flood rim level is below the closest upstream public sewer manhole cover.
2. Install the backwater valve in the building drain or in any branch drain that serves the fixtures requiring protection.
3. Do not discharge fixtures that have flood rim levels above the closest upstream manhole cover
through the backwater valve.
4. Provide access to the backwater valve through a water tight cover.
5. Use only approved backwater valves constructed with parts that will not corrode and will provide a positive mechanical seal.
6. Install a backwater valve that has at least (≥) the same capacity as the pipes served.