Model # 475

Internet #100153819

Store SKU #637520

null 4 in. ABS Backwater Valve

4 in. ABS Backwater Valve

$3140 /each

Frequently Bought Together

Product Overview

The NDS 4 in. ABS Backwater Valve is designed to protect low areas or basements from the backflow of waste from street sewers. The quick-action flapper allows unrestricted unidirectional flow and features an elastomeric gasket to ensure a watertight seal. It has limited lifetime warranty.

  • ABS is chemically resistant
  • Use to protect basements or low areas from street sewer backflow
  • Outdoor use
  • H x H connection
  • 5 psi maximum working pressure
  • Requires a working temperature of -30 - 140 degrees
  • Quick-action flapper allows an unrestricted, unidirectional flow and is easy to remove and replace
  • Elastomeric gasket in the flapper for a watertight seal
  • Threaded cap is designed for tightening by hand
  • Neoprene gasket in the access cap provides a positive seal
  • Valve hub outlets fit 4 in. DWV pipe




Warranty / Certifications

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Customer Questions & Answers

Can I use on a French drain system, I have a river that I'm discharge into for rain water, if the river gets too high

Asked by: Rog
The backwater valve fits schedule 40 (or ABS) pipe. There is no problem using this as part of a french drain system, but you might need to get some adapters depending on the type of pipe you are using.
Answered by: Dr. Drainage
Date published: 2016-05-30
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Customer Reviews

4 in. ABS Backwater Valve is rated 5.0 out of 5 by 2.
Rated 5 out of 5 by from GOING TO HELP SAVE MY HOUSE When we had our last big rain in 2015, the towns drain system was full and backing up in everyones sumb pump/ground water drain pipes that are hooked up to the towns drain. So this almost flooded my house, with this back water valve it will help stop this from happening again. These should be standard to be placed in your system . Easy to install, I had to dig some, cut into the drain pipe and put this in place, anyone can do this
Date published: 2016-05-31
Rated 5 out of 5 by from Great product at a great price Had a failure of the 30 year old original valve. Looked high and low for an economical and local solution. Order online and it came earlier than first estimated. The product fit well and is far superior to the original. With preparation, tools, lights, and crawling in and out of the crawl space, I was at the DIY for 90 minutes. Leak check 24 hours later showed a very good seal.
Date published: 2015-04-27
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