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Sioux Chief 869-S3PPK 3" PVC Backwater Valve for Horizontal Installation
The Sioux Chief 869-S3PPK is a 3" PVC backwater valve engineered for horizontal, behind-the-wall or under-slab drain-waste-vent (DWV) rough-in installations. Built with a PVC body sized for 3" DWV drain lines, it is designed to help block reverse flow of wastewater back through a horizontal branch or main drain run rather than letting it surcharge back toward fixtures. Manufactured in the United States and packaged 2 EA per box, the 869-S3PPK is sized and built for plumbers and contractors handling new construction rough-in, remodel work, or backflow-prevention retrofits on horizontal drain runs.
Key Features
- Trade Size: 3" connection sized to mate with 3" PVC DWV drain lines during rough-in.
- Durable Construction: PVC body offers corrosion and chemical resistance suited to below-slab, below-grade, and behind-the-wall rough-in use.
- Backwater Valve Function: Installed in-line on the drain to help stop wastewater from backing up into the building through the connected drain run during a municipal or lateral line surcharge.
- Installation Orientation: For horizontal installations only — per manufacturer instructions, do not install this valve in a vertical drain run.
- Packaging: Supplied 2 EA per box, making it easy to stock multiple rough-in installs on a single job or truck.
- Country of Origin: Manufactured in the United States.
Technical Specifications
- Country of Origin: United States
- Packaging: 2 EA
- Trade Size: 3"
- Material: PVC
- Installation Orientation: Horizontal Only
Typical Applications
- Horizontal DWV Drain Lines
- Below-Slab and Behind-the-Wall Rough-In
- Backflow and Sewage Backup Prevention
- Residential and Commercial Plumbing Rough-In
- New Construction and Remodel Installations
- Backwater Valve Retrofits on Existing Drain Runs
Why Sioux Chief?
Sioux Chief builds its PVC drainage products in the United States for the day-to-day demands of rough-in plumbing work, from new construction to remodel and retrofit jobs. The 869-S3PPK's PVC construction and dedicated 3" sizing give installers a straightforward, code-familiar way to add horizontal backwater protection to a DWV drain run without reworking the surrounding pipe. Because it is packaged 2 EA per box, crews can keep extras on the truck for multi-fixture or multi-unit jobs. Specifying Sioux Chief means working with drainage components plumbing professionals already rely on throughout rough-in DWV systems.
Manufacturer Resources
Spec Sheet
Product Specs
- Product Type:
- Backwater Valve
- Configuration:
- Horizontal Installation
- 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-S3PPK – Frequently Asked Questions
1) Can the Sioux Chief 869-S3PPK backwater valve be installed in a vertical drain stack?
No. The 869-S3PPK is a horizontal-installation backwater valve only, and the manufacturer's instructions say not to put it in a vertical drain run. If your backflow protection point is on a vertical stack, you need a valve built for vertical service instead. For a horizontal branch or main under the slab or behind a wall, this is the correct orientation.
2) Can I add the 869-S3PPK to an existing drain line, or is it only for new construction?
Both. The 869-S3PPK is used in new construction rough-in, remodel work, and backwater valve retrofits on existing horizontal drain runs. On a retrofit you cut into the existing 3 inch PVC horizontal run and solvent-weld the valve in line; the valve is sized so the surrounding pipe does not need to be reworked.
3) Will a PVC backwater valve hold up buried under a slab or below grade?
The 869-S3PPK body is PVC, which resists corrosion and the chemicals found in waste drainage, so it is suited to below-slab, below-grade, and behind-the-wall rough-in. It is the same material family as the DWV pipe it joins, so there is no dissimilar-material joint to worry about in the run.
4) What does a backwater valve on a horizontal drain actually protect against?
It sits in line on the drain and blocks wastewater from reversing back through the branch or main into the building when the municipal sewer or the building lateral surcharges. Without one, a surcharge pushes waste back up toward the lowest fixtures, which is why basement and below-grade fixtures are the usual reason to install the 869-S3PPK.
5) What part number do I order for the Sioux Chief 3 inch horizontal PVC backwater valve?
The manufacturer part number is 869-S3PPK, Sioux Chief brand, 3 inch PVC, horizontal configuration. There is one model, so the only thing to confirm before ordering is that your drain run is 3 inch and horizontal.
6) How many Sioux Chief 869-S3PPK valves come in a box?
They ship 2 each per box. For a property manager or plumbing contractor doing multi-unit or multi-fixture work, that means one box covers two rough-in locations, or leaves a spare on the truck.
7) Is the Sioux Chief 869-S3PPK made in the USA?
Yes, the 869-S3PPK is manufactured in the United States. That matters on government, institutional, and federally funded work where domestic-origin material is a condition of the spec.
How fast can I get the Sioux Chief 869-S3PPK delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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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-S3PPK come with a warranty?
Absolutely. The Sioux Chief 869-S3PPK 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-S3PPK?
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