Mainline ML-FR4 4″ ABS Retrofit Backwater Valve

The Mainline ML-FR4 4″ ABS Full-Port Retrofit Backwater Valve has 4″ ABS hub connections. This valve is typically installed in homes or buildings that have basements, cellars, crawl spaces or area that are accessible for servicing.

Features and benefits

•  Unlike other valves this valve has a minimal fall 3/8” through the body which means it’s easier to install.
•  Simply cut out enough pipe for valve and simply drop in and connect to plumbing system. This can be done in as little as 24” of excavation, if utilizing existing building cleanout.
• All other valves have greater falls through the body and require at least 4-5 feet
  of concrete breaking just to make up the fall through the body.
• NO 2-foot rule as in other valves