Model # 375

Internet #100128063

Store SKU #637487

null 3 in. ABS Backwater Valve

3 in. ABS Backwater Valve

$2376 /each
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Product Overview

NDS 3 in. ABS Backwater Valve protects low areas or basements from the backflow of waste from a street sewer. The quick-action flapper allows an unrestricted, unidirectional flow, and the flapper's elastomeric gasket ensures a watertight seal. Designed for use in the installation of non-pressurized drainage and sewer piping systems.

  • ABS construction is durable, lightweight, economical and resistant to corrosion and chemicals
  • Hub outlets are suitable for use with DWV pipe. May be adapted to sewer and drain pipe with NDS DWV to Sewer drain adapters
  • Hub x Hub solvent-welded connections
  • Fits 3 in. DWV Schedule 40 pipe
  • Maximum working pressure of 5 PSI
  • Working temperature range of -30 - 140 degrees Fahrenheit
  • Made to ASTM specifications
  • Elastomeric gasket in the flapper ensures a watertight seal
  • Neoprene gasket in the access cap provides a positive seal
  • Access riser with cover offers simple access to the backwater valve for inspection and maintenance
  • Threaded cap is designed for hand tightening
  • Black color
  • Made in the USA
  • NDS offers a full line of solvent weld fittings for all of your sewer and drain needs. NDS solvent weld fittings are offered in ABS, Styrene and PVC and range in size from 3 in. to 8 in.

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Name Sure-Vent 1-1/2 - 2 in. ABS Air Admittance Valve 3 in. ABS Backwater Valve 4 in. ABS Backwater Valve 160 DFU ABS Sure-Vent Air Admittance Valve
Brand Oatey
Ratings (12) (0) (2) (0)
Valve Outlet Diameter (in.) 1.5 3.75 4.9 3
Connection Snap-on Sewer & Drain Sewer & Drain Screw on
Valve Inlet Diameter (in.) 1.5 2.75 3.5 3
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Product Height (in.)
Product Length (in.)
Product Width (in.)
Valve Inlet Diameter (in.)
Valve Outlet Diameter (in.)


Compatible Pipe Material
Sewer & Drain
Acrylonitrile Butadiene Styrene (ABS)
Maximum Pressure (psi)
Maximum Working Temperature (F)
Product Weight (lb.)
Valve Type
Air Admittance

Warranty / Certifications

Manufacturer Warranty
Limited Lifetime

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Customer Questions & Answers

how are you going to install the in a existing sewer line when the inlet and outlet are at different heights???

Asked by: john
The is a difference of approximately 1/2" between the 2 sides of the backwater valve. The reason for the difference is to ensure that water continues to flow in the correct direction, even in cases where the pipe is installed with very little slope. If installed on an existing line you may need to excavate additional pipe so that you are able to adjust the pipe as needed.
Answered by: Dr. Drainage
Date published: 2016-03-03

Why didn't the extension and cap come with my order?

The backwater valve mounts under a slab and an extension is necessary how do I get the extension & cap?
Asked by: Michael
Thank you for your recent inquiry with The Home Depot. Unfortunately, I need more information from you in order to properly address your question. For any other questions, please call us at Customer Service 800-430-3376. Thank you for shopping Home Depot.
Answered by: THDSupport
Date published: 2015-09-20
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