Sioux Chief 869-S ABS DWV Back...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$55.54
Sioux Chief 869-S ABS DWV Backwater Valve

Sioux Chief 869-S ABS DWV Backwater Valve

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Model: 869-S3A

In Stock (leaves warehouse same day if ordered before 3pm ET)

$55.54
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Sioux Chief 869-S ABS DWV Backwater Valve

The Sioux Chief 869-S Backwater Valve is an ABS DWV line component engineered to prevent sewage and wastewater backflow in horizontal, gravity-flow drain installations. This 869S Series valve is available in 3" and 4" sizes to match standard Schedule 40 DWV drain-waste-vent piping, so plumbers can spec the correct valve for the line diameter on a given job. Molded from tough, engineered ABS resins, the valve body is structurally rugged and built for behind-the-wall or under-slab rough-in work. Its modular design accepts interchangeable accessories, and the body can be configured for either shallow-bury or deep-bury installation depending on trench and slab conditions. This is a rough-in drainage component intended for plumbers and contractors working on 3" or 4" Schedule 40 DWV lines, not a decorative fixture.

Key Features

  • Available Sizes: Offered in 3" and 4" configurations to match standard Schedule 40 gravity drain-waste-vent piping.
  • Durable Construction: Molded from tough, engineered ABS resins for structural ruggedness in buried, behind-the-wall installations.
  • Backwater Protection: Functions as a check valve on horizontal, gravity-flow lines to help block reverse flow and sewage backup into the structure.
  • Adaptable Bury Depth: Valve body can be configured for shallow-bury or deep-bury installation to match trench and slab conditions.
  • Modular Accessory Design: Interchangeable accessory components allow the valve to be configured for different installation scenarios without replacing the entire unit.
  • Horizontal Installation: Engineered specifically for horizontal, gravity-flow lines — not rated for vertical or pressurized applications.
  • Packaging: Supplied in cartons of 4 EA for distribution and jobsite stocking.

Technical Specifications

  • Country of Origin: United States
  • Packaging: 4 EA
  • Available Sizes: 3", 4"
  • Material: ABS

Typical Applications

  • Residential and Commercial DWV Rough-In
  • Basement and Below-Grade Drain Lines Prone to Backflow
  • New Construction Sewer and Drain Line Installation
  • Renovation and Drain Line Retrofit Projects
  • Buried, Behind-the-Wall or Under-Slab Drain Runs

Why Sioux Chief?

Sioux Chief builds the 869S Series backwater valve from tough, engineered ABS resins so it can stand up to the structural demands of buried, gravity-flow DWV installations in both the 3" and 4" sizes contractors need. The modular, interchangeable-accessory design gives plumbers and contractors flexibility to adapt a single valve platform to shallow-bury or deep-bury conditions without sourcing multiple part numbers for every job. Manufactured in the United States and packaged 4 EA per carton, this ABS backwater valve line is built for straightforward rough-in installation on horizontal drain lines across a range of DWV pipe sizes.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Backwater Valve
Configuration:
Horizontal Gravity-Flow
Country of Origin:
United States
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves
Product Size:
3"

Sioux Chief 869-S3A – Frequently Asked Questions

1) What size DWV lines does the Sioux Chief 869-S backwater valve fit?
The 869-S comes in 3 inch and 4 inch, sized to standard Schedule 40 DWV drain-waste-vent pipe. Order the 869-S3A for a 3 inch line and the 869-S4A for a 4 inch line. There is no reducing version, so match the valve to the actual line diameter rather than adapting up or down at the valve.
2) Can this backwater valve be installed on a vertical stack or a pumped sewage line?
No. The 869-S is built for horizontal, gravity-flow drain lines only and is not rated for vertical or pressurized applications. If the discharge is pumped or the run is vertical, this is the wrong device for the job.
3) Will the 869-S work under a slab, or is it only for shallow trench work?
Both. The valve body can be configured for shallow-bury or deep-bury installation, so the same platform covers an under-slab rough-in and a shallower trench run. The ABS body is intended for buried and behind-the-wall work.
4) What is the Sioux Chief 869-S backwater valve made of, and will it solvent weld to my ABS drain pipe?
The body is molded from engineered ABS resins, the same material family as ABS DWV pipe and fittings, so it pairs with an ABS drainage system. On a PVC DWV system, confirm the joining method your local code allows before specifying it.
5) Do I have to replace the whole valve if the installation conditions change?
No. The 869S Series uses a modular design with interchangeable accessory components, so one valve body can be reconfigured for a different installation scenario instead of sourcing a separate part number per job. That is useful for contractors stocking a truck for both shallow and deep-bury conditions.
6) How does a backwater valve like the 869-S differ from a standard DWV check fitting on a basement line?
A backwater valve is the device you put on a below-grade branch or building drain specifically to block reverse flow when the sewer surcharges, protecting basement fixtures from sewage backup. The 869-S does that on a horizontal gravity line, 3 inch or 4 inch. It is a rough-in drainage component, not a decorative fixture or a pressure-rated valve.
7) Is the Sioux Chief 869-S sold individually or by the case?
It is supplied in cartons of 4 each, per size. Distributors and jobsite stocking programs should plan quantities in multiples of four.
How fast can I get the Sioux Chief 869-S3A 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 Sioux Chief 869-S3A come with a warranty?
Absolutely. The Sioux Chief 869-S3A 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 Sioux Chief 869-S3A?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Sioux Chief 869-S3A from ZenSupply?
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