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3 in. PVC Backwater Valve
43900 - spec sheet
Features
- Can accommodate access sleeves made of Schedule 40 pipe
- Entire valve assembly
- Hub by hub solvent weld connection
- Elastomeric seal in quick action flapper ensures a water tight seal
- Valve hub fits DWV pipe and can be adapted for sewer and drain pipe
- 3 in. PVC backwater valve
- Threaded access cap incorporates a neoprene seal for positive sealing and can be tightened or removed by hand
- Fits 3 in. PVC Schedule 40 pipe
- Protects low areas or basements from backflow or waste from street sewers
43900 - spec sheet
Manufacturer Resources
Product Specs
- Volume:
- 0.238
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Fittings
- Product Type:
- General Fittings
- Product Weight:
- 2.5
OATEY 43900 – Frequently Asked Questions
1) Will the Oatey 43900 backwater valve fit 3 inch PVC Schedule 40 pipe?
Yes. The 43900 is a 3 in. PVC backwater valve with hub by hub solvent weld connections, and it fits 3 in. PVC Schedule 40 pipe. The hubs take DWV pipe and can be adapted for sewer and drain pipe, so you solvent weld it inline rather than threading it in.
2) What does a backwater valve on a basement drain line actually do?
It stops flow coming back at you. The Oatey 43900 protects low areas or basements from backflow of waste from street sewers: normal drainage pushes the flapper open, and when the municipal line surcharges the flapper closes against its elastomeric seal to hold a water tight seal. That is the part that keeps a sewer backup out of a finished basement or a ground floor unit.
3) Can you service or clear the flapper on the Oatey 43900 without cutting the pipe?
Yes, that is the point of the design. The 43900 has a threaded access cap with a neoprene seal that can be tightened or removed by hand, so you can open the body, inspect the flapper and clear debris with no tools and no cutting. For a property manager putting these on a maintenance schedule, that hand-removable cap is what makes annual inspection realistic.
4) If the Oatey 43900 is buried below a slab or in a yard, how do you reach the access cap?
You run an access sleeve up to grade or to the floor surface. The 43900 accommodates access sleeves made of Schedule 40 pipe, so you extend off the valve with standard 3 in. Sch 40 and finish it at the surface. Plan that sleeve during rough-in, because a buried valve you cannot open is a valve nobody will ever inspect.
5) Does the Oatey 43900 come as a complete valve or do I have to buy the flapper and cap separately?
It ships as the entire valve assembly, body, quick action flapper with its elastomeric seal, and the threaded access cap with neoprene seal. What you add is the solvent cement and primer for the two hub joints, plus whatever 3 in. Schedule 40 pipe you need for an access sleeve.
6) Can I put the Oatey 43900 on a cast iron or ABS drain line?
Not directly. Both ends are PVC solvent weld hubs sized for 3 in. PVC, so joining to cast iron or ABS means transitioning first, typically with a shielded no-hub coupling to the cast iron or an approved transition at the ABS. The hubs themselves only take PVC DWV pipe, or sewer and drain pipe with an adapter.
7) Is the Oatey 43900 the right choice for a floor drain, or do I need a different device?
The 43900 is an inline valve: it solvent welds into a 3 in. PVC run to protect everything downstream of the fixtures it serves. If you only need to stop a single floor drain from bubbling over, a backwater device that drops into the drain body is the smaller job. Where you want the whole basement group protected from a street sewer surcharge, the inline 3 in. valve is what does it.
8) What is the exact Oatey part number for the 3 inch PVC backwater valve?
Oatey 43900. That is the manufacturer part number and there is one configuration of it, a 3 in. PVC hub by hub body supplied as the complete valve assembly. No handing, no size or finish options to specify when you order.
How fast can I get the OATEY 43900 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 43900 come with a warranty?
Absolutely. The OATEY 43900 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 43900?
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