475 ABS Air Admittance Valve Backwater Valve, 4 in. Black

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About This Product

Protect basements and other low-lying areas from sewer backflow with the ABS 4 in. Backwater Valve. Designed for horizontal installation, this lightweight and chemically resistant valve provides a reliable one-way flow system. The quick-action flapper opens to allow waste to pass through and automatically closes to prevent reverse flow. Featuring an elastomeric gasket for a watertight seal, the flapper is also removable and replaceable if needed. The valve’s neoprene-gasketed access cap offers secure sealing, and hub outlets fit 4 in. DWV pipe. Ideal for use in residential or commercial waste systems, this valve offers a durable and cost-effective solution.

Highlights

• Allows waste to flow in one direction while preventing sewer backflow 

• Ideal for basement drainage systems and sewer installations 

• Durable ABS construction provides resistance to chemicals 

• Flapper includes elastomeric gasket for watertight sealing 

• Threaded access cap is sealed with a neoprene gasket 

• Lightweight design simplifies installation 

• Compatible with NDS and other standard DWV systems 

• Connects to 4 in. DWV pipe using solvent cement 

• IAPMO listed for assurance of quality and safety 

• Designed to work with NDS backwater valve components and adapters 

• Use with appropriately sized fittings for secure connections

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