- Protects low areas and basements from backflow or waste water
- Tight, waterproof elastomeric seal inside flapper
- Hub fits DWV but can be adapted for sewer and drain
- See More Details
Frequently Bought Together
Product Overview
- Protects low areas or basements from backflow or waste from street sewers
- Elastomeric seal in quick action flapper ensures a water tight seal
- 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
- Threaded cap
Info & Guides
Product Overview
- Protects low areas and basements from backflow or waste water
- Tight, waterproof elastomeric seal inside flapper
- Hub fits DWV but can be adapted for sewer and drain
Compare Similar Water Pressure Regulators
|  |  |  | |
| Brand | Oatey | Oatey | Oatey | Oatey |
| Name | 4 in. PVC DWV Backwater Valve | 3 in. ABS Backwater Valve | 3 in. PVC Backwater Valve | 4 in. ABS Backwater Valve |
| Price | $3038 | $3166 | $3411 | $3868 |
| Ratings | (32) | (2) | (32) | (2) |
| Connection | Sweat | Sweat | Sweat | Sweat |
| Application | Non-Potable Water | Sewage | Non-Potable Water | Sewage |
| Maximum Pressure (psi) | 80 | 24 | 80 | 24 |
| Compatible Pipe Material | PVC | CPVC | PVC | CPVC |
| Material | PVC | Acrylonitrile Butadiene Styrene (ABS) | PVC | Acrylonitrile Butadiene Styrene (ABS) |
| Maximum Working Temperature (F) | 150 | 120 | 150 | 120 |
| Indoor/Outdoor | Indoor | Indoor | Indoor | Indoor |
| View Product | View Product | View Product | View Product |
Compare Similar Water Pressure Regulators
| | | | |
| Brand | Oatey | Oatey | Oatey | Oatey |
| Name | 4 in. PVC DWV Backwater Valve | 3 in. ABS Backwater Valve | 3 in. PVC Backwater Valve | 4 in. ABS Backwater Valve |
| Price | $3038 | $3166 | $3411 | $3868 |
| Ratings | (32) | (2) | (32) | (2) |
| Connection | ||||
| Application | ||||
| Maximum Pressure (psi) | ||||
| Compatible Pipe Material | ||||
| Material | ||||
| Maximum Working Temperature (F) | ||||
| Indoor/Outdoor | ||||
| View Product | View Product | View Product | View Product |
Specifications
Dimensions
Details
Warranty / Certifications
Questions & Answers
I HAVE A 3 in oatey pvc backwater valve the flaper cam off its 7 ft down its not needed can i bra...
Asked by mac December 31, 2020The flapper should be removed somehow as this can cause a blockage if left in your line.
When this valve is completely submerged, the flap floats, letting water back up through. Any way ...
Asked by Aswa July 30, 2020If it is completely submerged with no flow in any direction the flapper will float. The flapper needs some head pressure to either open or close if it is coming back up into the main.
Does Home Depot sells a 2 inches PVS DWV Backwater valve?
Asked by Sid June 10, 2020Oatey does not carry a 2" backwater valve.
Can this be used vertically?
Asked by Rainman May 7, 2020No, this must be installed horozontally.
Most of the sewer piping is 4 inch. Why in the specifications says it is a 3 in inlet and 4 in. o...
Asked by Rilo March 24, 2020This is for 4" - Valve hub fits DWV pipe and can be adapted for sewer and drain pipe.
Any way to get replacement o rings for this?
Asked by JR August 22, 2019Please reach out to oatey customer service for assistance with this question. (800) 321-9532
Can I use this at the end of my French drain outlet that discharges into a storm water ditch? Sometimes that ditch
Asked by Nick April 13, 2019This Backwater valve allows a one directional flow of water and a flapper that will close to prevent any back flow (assuming nothing is in the line holding the flapper open). We recommend you call Oatey Technical to discuss your specific application details. 1-800-203-1155.
Can this be installed below grade outside? Will I need to make it accessible or can it be buried?...
Asked by StinkyFingers March 25, 2019Yes, this product can be used outside below grade. Remember that if the backwater cap is below finished grade, a riser pipe will need to extend upwards off of the backwater cap to the finished grade of the cement or grass. This riser is needed for inspection and cleaning access. The backwater valve must be installed level to allow the internal flapper to operate properly.
the existing valve I have now is 4 3/4" across the top of the part that fits into a , I think it...
Asked by ang January 9, 2019The inlet diameter is 3 inches and the outlet diameter is 4 inches.
how does it work, The picture does not show the inside?
Asked by ang January 9, 2019There is a flap inside to prevent water from flowing back
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