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Adapt-a-Valve - Mainline
Backwater valves and backflow preventers are not at all the same thing
Sewer Backflow Preventer
Mainline Backflow Valve installation, Part 1 - YouTube
Sewage Backflow Preventers: Great Idea, But Can New York Get It Done
Demo of Sewer Backflow Prevention Device at ACE 2010 - YouTube
How Backwater Valves work, Basic Principles - YouTube