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NDS 375 - 3 in. ABS Backwater Valve, Black Hub Outlet

NDS 375 - 3 in. ABS Backwater Valve, Black Hub Outlet

Brand: NDS
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$143.95
$107.97
SKU 375

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The NDS 375 is a 3 in. ABS backwater valve designed to protect basements and low-lying areas from sewer backflow. Lightweight and chemically resistant, it provides one-way flow control with easy access for inspection and maintenance.

  • Material: Durable ABS construction; also available in PVC for alternative installations.
  • Size & connections: 3 in. nominal hub outlets fit DWV pipe; may be adapted to 2, 3, 4 or 6 in. sewer and drain pipe with NDS DWV-to-sewer & drain adapters.
  • Reliable seal: Quick-action flapper with elastomeric gasket and a threaded access cap with neoprene gasket for a watertight seal.
  • Serviceable design: Flapper is removable and replaceable; access riser with cover permits inspection and can be cut to desired length.
  • Installation: Horizontal installation required; arrows on the valve hub indicate flow direction for correct placement.
  • Benefits: Lightweight, easy to install; a cost-effective, chemically resistant alternative to cast iron valves.

Ideal for residential and light commercial drainage systems, the NDS 375 delivers dependable protection against sewer backflow. Always follow local plumbing codes and the manufacturer's instructions. See NDS product literature for full specifications, certifications, and installation details.

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Frequently Asked Questions

What orientation is required when installing the NDS 375 valve?
Install horizontally with the arrow on the hub pointing in the flow direction. Follow local plumbing codes and manufacturer guidance.
Which pipe sizes and connections does the 375 backwater valve fit?
Nominal 3 in. hub outlets connect to DWV pipe and may be adapted to 2, 3, 4 or 6 in. sewer and drain pipe with NDS adapters.
How do I service or replace the flapper and seal?
Open the threaded access cap to inspect. The flapper is removable and replaceable; replace elastomeric seals if worn to maintain a watertight seal.