Sioux Chief 883-AT ABS Closet ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$4.40
Sioux Chief 883-AT ABS Closet Flange with TKO Knockout, 3" Hub x 4"

Sioux Chief 883-AT ABS Closet Flange with TKO Knockout, 3" Hub x 4"

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Model: 883-AT

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

$4.40
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Sioux Chief 883-AT ABS Closet Flange with TKO Knockout, 3" Hub x 4"

The Sioux Chief 883-AT is a one-piece ABS closet flange built for rough-in toilet installations, sized for a 3" hub connection with a 4" test knockout (TKO) feature. The flange is molded as a single ABS piece and paired with a corrosion-resistant 430 stainless steel swivel ring, giving installers a solid connection point for the closet bolts while keeping the ring free to rotate for proper bolt alignment during setting. This design is covered under patent #5,377,361 and is engineered specifically so the test knockout will not break apart into loose pieces and cannot fall down the drain pipe during rough-in testing or final installation — a common failure point with lower-quality flanges.

Key Features

  • Trade Size: 3" hub connection with a 4" test knockout (TKO), sized to match standard closet drain rough-in dimensions.
  • Durable Construction: One-piece ABS body resists the corrosion and cracking that can affect lower-grade plastic flanges over time.
  • Corrosion-Resistant Swivel Ring: 430 stainless steel swivel ring rotates freely for precise closet bolt alignment while resisting rust at the connection point.
  • Secure Test Knockout: The TKO knockout will not break apart during testing and cannot fall down the drain pipe, preventing blockages and callbacks.
  • Patented Design: Flange construction is protected under patent #5,377,361.

Technical Specifications

  • Country of Origin: United States
  • Packaging: 25 EA per carton
  • Material: One-piece ABS with 430 stainless steel swivel ring
  • Hub / Knockout Size: 3" Hub / 4" TKO

Typical Applications

  • Residential and Commercial Toilet Rough-In Plumbing
  • New Construction Closet Drain Installations
  • Renovation and Remodel Closet Flange Replacement
  • ABS Drain-Waste-Vent (DWV) Pipe Systems

Why Sioux Chief?

Sioux Chief engineers its 883-AT closet flange with a one-piece ABS body and a corrosion-resistant 430 stainless steel swivel ring, combining a patented knockout design that holds up during rough-in testing with hardware that stays aligned for a clean, secure closet bolt setting. Plumbers and contractors rely on this flange for consistent, repeatable performance on 3" hub x 4" TKO rough-in jobs.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Closet Flange
Configuration:
Test Knockout (TKO)
Product Finish:
Stainless Steel Swivel Ring
Country of Origin:
United States
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Drains and Cleanouts
Product Material:
ABS
Product Size:
3" Hub x 4"

Sioux Chief 883-AT – Frequently Asked Questions

1) Will the Sioux Chief 883-AT closet flange fit 3 inch ABS pipe?
The 883-AT is a 3 inch hub closet flange, so the hub accepts 3 inch ABS DWV pipe inserted into it and solvent welded. The 4 inch dimension refers to the test knockout (TKO), not a 4 inch pipe connection. If your closet drain riser is 4 inch pipe, this is not the flange for that opening.
2) What does the TKO on a closet flange actually do during rough-in?
TKO stands for test knockout. The flange ships with the opening closed off so the DWV system can be filled and pressure or water tested before the toilet is set, then the knockout is driven out when it is time to connect. On the Sioux Chief 883-AT the knockout is engineered so it will not break into loose pieces and cannot fall down the drain pipe, which is what causes blockages and callbacks with cheaper flanges.
3) Can I glue an ABS closet flange to PVC drain pipe?
The 883-AT body is ABS, so it is intended for ABS drain-waste-vent systems and solvent welds to ABS pipe. Joining it to PVC is a dissimilar-material joint that ABS cement is not made for. On a PVC system, use a PVC closet flange of the same 3 inch hub size instead.
4) Does the Sioux Chief 883-AT come with a swivel ring for the closet bolts?
Yes, it comes with a 430 stainless steel swivel ring already on the flange. The ring rotates so you can line the closet bolts up with the toilet base instead of being locked into whatever orientation the hub glued up in. Stainless resists rust at the bolt slots, which is where plated steel rings usually fail. Closet bolts and the wax ring are separate purchases.
5) Is this flange suitable for a toilet flange replacement in a remodel, or is it rough-in only?
Both. The 883-AT is used for new construction closet drain installs and for renovation work where an old flange is cut out and replaced, as long as the stub-out is 3 inch ABS. In a remodel you are gluing over the existing 3 inch pipe, so the pipe has to be cut back cleanly enough to seat in the hub.
6) How many Sioux Chief 883-AT flanges come in a carton?
Cartons are 25 each. That matters if you are buying for a multi-family or tract job and want to keep a box on the truck rather than ordering per unit. It is also made in the United States, which answers domestic-preference requirements on public and institutional work.
7) Is the Sioux Chief 883-AT a one-piece flange or does the ring bolt on?
The body is molded as a single ABS piece, so there is no glued or mechanically joined collar to come apart under the toilet. The only separate component is the stainless swivel ring that carries the closet bolts. The construction is covered under patent 5,377,361.
How fast can I get the Sioux Chief 883-AT 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 883-AT come with a warranty?
Absolutely. The Sioux Chief 883-AT 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 883-AT?
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 883-AT from ZenSupply?
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