Title: (Optional) Describe the use of a backwater valve.
Course: Plumbing II (17058-II) > Section: Installing Waste and Soil Pipes

Description should note that the backwater valve prevents the dangerous reversal of flow in a piping system that can contaminate the system.

Process/Skill Questions:

- How does a backwater valve work?
- Where are backwater valves required?
- What tools are needed to install a backwater valve?