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4 in. PVC Backwater Valve
43904 - spec sheet
Features
- Hub by hub solvent weld connection
- Entire valve assembly
- Protects low areas or basements from backflow or waste from street sewers
- Threaded access cap incorporates a neoprene seal for positive sealing and can be tightened or removed by hand
- Valve hub fits DWV pipe and can be adapted for sewer and drain pipe
- Can accommodate access sleeves made of Schedule 40 pipe
- 4 in. PVC backwater valve
- Elastomeric seal in quick action flapper ensures a water tight seal
- Fits 4 in. PVC Schedule 40 pipe
43904 - spec sheet
Manufacturer Resources
Product Specs
- Volume:
- 0.454
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Fittings
- Product Type:
- Plastic Fittings
- Product Finish:
- White
- Product Material:
- PVC
- Product Weight:
- 4.825
OATEY 43904 – Frequently Asked Questions
1) Will the Oatey 43904 backwater valve connect to 4 inch PVC Schedule 40 DWV pipe?
Yes. The 43904 is a hub by hub solvent weld valve sized for 4 inch PVC Schedule 40 pipe. Both ends are hubs, so you cut the line, prime and cement the valve in, and you are done. The hubs fit DWV pipe and can be adapted for sewer and drain pipe if that is what is in the ground.
2) What does a 4 inch PVC backwater valve actually do in a basement drain line?
It stops sewage from coming back up. The 43904 sits in the building drain and its quick action flapper swings open for normal outbound flow, then closes when the street sewer surcharges, protecting basements and other low areas from backflow. The flapper carries an elastomeric seal for a watertight close.
3) Can I get to the flapper for cleaning after the valve is cemented in?
Yes. The threaded access cap on the 43904 can be tightened or removed by hand, no tools needed, and a neoprene seal in the cap keeps it sealed. For valves buried below a finished floor, the body accommodates an access sleeve made from Schedule 40 pipe so you can bring the cleanout up to grade.
4) Do I need to buy the flapper and cap separately with the Oatey 43904?
No. The 43904 ships as an entire valve assembly, body, flapper and threaded access cap included. What is not included is the solvent cement and primer for the two hub joints, and any Schedule 40 pipe you use for an access sleeve up to the floor.
5) Is the Oatey 43904 PVC or ABS, and what color is it?
PVC, in white. That matters for cementing: use PVC solvent cement and primer on both hubs. If the existing drain line is black ABS, you will need a transition, since PVC cement is not the right chemistry for an ABS to PVC joint.
6) I manage a building where tenants keep getting sewer backups. Is one 4 inch valve on the main the right approach?
A backwater valve like the Oatey 43904 goes in the drain line serving the fixtures you want protected, which is why it is usually set on the branch serving basement or below-grade fixtures rather than on a line carrying gravity flow from upper floors. Size it to the pipe: this one is for 4 inch PVC Schedule 40. Where the run is larger or a different material, match the valve to the pipe rather than bushing down.
How fast can I get the OATEY 43904 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the OATEY 43904 come with a warranty?
Absolutely. The OATEY 43904 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the OATEY 43904?
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selection,
installation tips, and troubleshooting. Contact Us
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