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Backwater Valves

Prevent street sewer waste from backflowing into basements or low areas with the backwater valve. Valve is lightweight and easy to install. Horizontal installation required; arrows on valve hub point in the direction of water flow.

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The NDS White 2 in. PVC Backwater Valve (NDS 275P) prevents street sewer waste from backflowing into basements or low areas
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The flapper opened inside of the NDS White 2 in. PVC Backwater Valve (NDS 275P) controls the flow of water

Key Features

  • Backwater valves have a quick action flapper to allow unrestricted uni-directional flow
  • NDS offers 2 in. – 6 in. PVC or ABS backwater valves and 4 in. PVC or ABS diverter valves
  • Backwater valves are a chemically resistant alternative to cast iron valves
  • Diverter valves direct flow one-way to individual or multiple septic tank leach fields; valve stem is used to divert flow through limited outlets
  • remove stem to allow flow through all outlets
  • Both backwater and diverter valves are made of polyvinyl chloride (PVC) or acrylonitrile butadiene styrene (ABS)

Applications

  • Use backwater valves for low basement areas and sewage system installations; works with most DWV pipe to transport waste and prevent backflow in pressurized systems
  • Use diverter valves for septic tank leach fields and sewage system installations

Installation & Maintenance

  • Backwater valve has two ends that connect to DWV pipe; need solvent cement to keep in place
  • Diverter valve has four ends that connect to sewer and drain pipe; need solvent cement to keep in place
  • Valve performance issues can indicate damage or clogging; service or replace as needed

Materials & Sustainability

  • Both backwater and diverter valves are made of polyvinyl chloride (PVC) or acrylonitrile butadiene styrene (ABS)
  • Backwater valve flapper gasket is made of elastomeric material; access cap gasket is made of neoprene material
  • Onsite flow management protects pipe systems from backflow which can lead to corrosion of pipes, property damage, and issues with the flow system

Product Models

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14 products

    Part Number
    (click for more info)    		 Description
    275 ABS Backwater Valve, 2 in., Black
    375 ABS Backwater Valve, 3 in., Black
    475 ABS Backwater Valve, 4 in., Black
    675 ABS Backwater Valve, 6 in., Black
    575 ABS Diverter Valve, 4 in., Black
    1530603 PVC Backwater Valve Flapper, 6 in., White
    475PS PVC Backwater Valve with Adapter, 4 in., White
    375PR PVC Backwater Valve with Riser and Cover, 3 in., White
    475PR PVC Backwater Valve with Riser and Cover, 4 in., White
    275P PVC Backwater Valve, 2 in., White
    375P PVC Backwater Valve, 3 in., White
    475P PVC Backwater Valve, 4 in., White
    675P PVC Backwater Valve, 6 in., White
    575P PVC Diverter Valve, 4 in., White

    Specifications & Documents