Sioux Chief 869S Series PVC Ba...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$38.64
Sioux Chief 869S Series PVC Backwater Valve, Schedule 40 DWV

Sioux Chief 869S Series PVC Backwater Valve, Schedule 40 DWV

(No reviews yet) Write a Review

Model: 869-S3P

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

$38.64
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Sioux Chief 869S Series PVC Backwater Valve, Schedule 40 DWV Line

The Sioux Chief 869S Series PVC Backwater Valve is built for horizontal, gravity-flow drain-waste-vent (DWV) installations, available for 3" and 4" Schedule 40 DWV lines. Molded from tough, engineered resins, this backwater valve is designed to help prevent sewage backflow in rough-in drainage systems. The modular valve body accepts interchangeable accessories and can be adapted for either shallow-bury or deep-bury installation, giving plumbers and contractors flexibility on the jobsite without having to swap valve platforms between burial depths. Whether the run is sized at 3" or 4" Schedule 40 DWV pipe, the 869S Series provides a consistent, structurally rugged solution for below-grade backflow protection.

Key Features

  • Trade Size Range: Available for 3" and 4" Schedule 40 DWV drain lines, covering common residential and commercial rough-in sizes.
  • Durable Construction: Molded from tough, engineered PVC resins for a structurally rugged valve body that stands up to below-grade installation conditions.
  • Installation Flexibility: Can be adapted for shallow-bury or deep-bury installations, allowing the valve to be configured for varying burial depths without requiring a different part number.
  • Modular Design: Interchangeable accessories let contractors service or reconfigure the valve body on-site as conditions require, rather than replacing the entire unit.
  • Application Scope: Intended strictly for horizontal, gravity-flow DWV installations - not for pressurized or vertical applications.
  • Material: PVC body suited for connection into Schedule 40 DWV piping systems for long-term corrosion resistance below grade.

Technical Specifications

  • Country of Origin: United States
  • Packaging: 4 EA per case
  • Trade Size: 3" and 4" Sch. 40 DWV
  • Material: PVC, molded engineered resin

Typical Applications

  • Horizontal, Gravity-Flow Drain-Waste-Vent (DWV) Lines
  • Below-Grade Backflow Prevention on 3" or 4" Sch. 40 Drain Runs
  • Residential and Commercial Rough-In Plumbing
  • New Construction and Retrofit Sewer Line Protection
  • Shallow-Bury or Deep-Bury Underground Installations

Why Sioux Chief?

Sioux Chief engineers the 869S Series backwater valve with a structurally rugged, molded PVC body and a modular design that gives plumbers and contractors the flexibility to adapt a single valve platform to shallow-bury or deep-bury conditions on either 3" or 4" Schedule 40 DWV lines. Interchangeable accessories mean the valve can be serviced and reconfigured on-site rather than replaced, and U.S. manufacturing supports consistent quality for rough-in drainage work across the full size range.

Note: This product carries a Proposition 65 warning. Refer to the manufacturer's spec sheet and instruction sheets for complete installation guidance.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Backwater Valve
Connection Type:
DWV Sch. 40
Country of Origin:
United States
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves
Product Material:
PVC
Product Size:
3"

Sioux Chief 869-S3P – Frequently Asked Questions

1) Can the Sioux Chief 869S backwater valve be installed on a vertical stack or a pressurized line?
No. The 869S Series is built strictly for horizontal, gravity-flow drain-waste-vent runs. It is not for pressurized or vertical applications. If your line is a vertical stack or under pressure, this is the wrong device for the opening.
2) What pipe does the 869S backwater valve connect to?
It connects into Schedule 40 DWV piping, in 3 inch and 4 inch trade sizes. The PVC body is molded for that system, so it solvent-welds into standard PVC DWV drain runs. Order the 869-S3P for a 3 inch line or the 869-S4P for a 4 inch line.
3) Do I need a different part number for a deep-bury versus a shallow-bury installation?
No, the same valve covers both. The 869S body is modular and can be adapted for shallow-bury or deep-bury installation, so you are not switching valve platforms when the depth changes. You select the size (3 inch or 4 inch) and configure the body for your burial depth.
4) Which size backwater valve do I use for a house sewer line?
Match the valve to the pipe. A 3 inch Schedule 40 DWV branch or smaller residential building drain takes the 3 inch valve (869-S3P); a 4 inch building sewer, which is the common size for a single-family house drain and most commercial laterals, takes the 4 inch (869-S4P). Those are the two sizes the 869S Series is made in.
5) If the flapper or internals foul after a few years, do I have to dig out and replace the whole valve?
The 869S is designed around interchangeable accessories, so the valve body can be serviced or reconfigured on site rather than replaced outright. That is the practical argument for it on a below-grade sewer run where excavating the body again is the expensive part.
6) Will a PVC backwater valve hold up buried in soil?
The 869S body is molded from engineered PVC resins for below-grade service, and PVC does not corrode the way a cast or ferrous body does in wet soil. It is intended for underground installation on 3 inch or 4 inch Schedule 40 drain runs, in both new construction and retrofit sewer protection.
7) How many Sioux Chief 869S valves come in a case?
Case quantity is 4 each. That matters if you are a distributor or a plumbing contractor buying for a tract or a multi-family rough-in rather than a single repair.
8) Is there a Proposition 65 warning on the Sioux Chief 869S valve?
Yes, the 869S Series carries a Proposition 65 warning. California jobs and procurement packages that require that disclosure should capture it. Full installation detail is in the manufacturer's spec and instruction sheets.
How fast can I get the Sioux Chief 869-S3P 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-S3P come with a warranty?
Absolutely. The Sioux Chief 869-S3P 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-S3P?
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-S3P from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!