Sioux Chief 881 Dual-Fit Knock...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$0.35
Sioux Chief 881 Dual-Fit Knockout Test Plug, PVC/ABS Schedule 40

Sioux Chief 881 Dual-Fit Knockout Test Plug, PVC/ABS Schedule 40

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Model: 881-1

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

$0.35
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Sioux Chief 881 Dual-Fit Knockout Test Plug, PVC/ABS Schedule 40

The Sioux Chief 881 Knockout Test Plug is a solvent-weld test cap built for rough-in plumbers who need a fast, reliable way to pressure or air test a DWV line before closing in a wall or slab. This family of knockout test plugs is available in four selectable sizes — 1-1/2", 2", 3", and 4" Knockout — so one series covers the common Schedule 40 PVC or ABS line sizes found on nearly every rough-in job. The dual-fit configuration solvent welds over 1-1/2" and 2" PVC or ABS Schedule 40 pipe, or over 3" and 4" PVC or ABS Schedule 40 pipe, letting a single part number cover two common line sizes and reducing the number of SKUs a contractor has to stock on the truck. A standard knockout option is also available within the series, which solvent welds directly into the pipe for jobs where an internal fit is preferred over an external cap. Every configuration in the 881 line is built for a secure, code-driven test seal during rough-in inspection, then knocks out cleanly once testing is complete and the line is ready to be finished. Supplied in a 500 EA case pack, the 881 series is sized for distributors and contractors running volume rough-in work across new construction and renovation projects.

Key Features

  • Knockout Size Options: Available in 1-1/2", 2", 3", and 4" Knockout sizes to match the line size being tested.
  • Dual-Fit Sizing: Solvent welds over 1-1/2" and 2", or 3" and 4" PVC or ABS Schedule 40 pipe, covering two line sizes with one part.
  • Standard Knockout Option: Standard knockout test plugs solvent weld into PVC or ABS Schedule 40 pipe for an internal-fit test seal.
  • Solvent-Weld Connection: Bonds directly to PVC or ABS Schedule 40 DWV pipe for a secure seal during pressure/air testing.
  • Removable Knockout Design: Knocks out after test approval so the line can be tied in and finished without cutting pipe.
  • Schedule 40 Compatible: Engineered to mate with Schedule 40 PVC or ABS fittings commonly used in drain-waste-vent rough-in.
  • Bulk Case Pack: Packaged 500 EA per case for distributors and contractors stocking high-volume rough-in jobs.

Technical Specifications

  • Country of Origin: United States
  • Packaging: 500 EA
  • Fit Sizes: 1-1/2" x 2" or 3" x 4" (dual-fit cap); individual Knockout options of 1-1/2", 2", 3", or 4" also available
  • Pipe Material Compatibility: PVC or ABS Schedule 40

Typical Applications

  • DWV Line Pressure and Air Testing During Rough-In Inspection
  • Residential and Commercial New Construction Plumbing
  • Renovation and Remodel Rough-In Plumbing
  • PVC and ABS Schedule 40 Drain-Waste-Vent Systems
  • Distributor and Contractor Bulk Stocking for Rough-In Crews

Why Sioux Chief?

Sioux Chief builds rough-in plumbing components for the realities of the jobsite, and the 881 Knockout Test Plug series reflects that with size options from 1-1/2" through 4" and a dual-fit design that cuts down on truck inventory while still giving plumbers a dependable solvent-weld test seal on PVC or ABS Schedule 40 pipe. Supplied in volume case packs and made in the United States, the 881 series is built for contractors and distributors who need consistent, no-surprise test caps for everyday rough-in work.

Manufacturer Resources

Product Specs

Product Type:
Test Plug
Connection Type:
Solvent Weld
Country of Origin:
United States
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves
Product Material:
PVC
Product Size:
1-1/2" - 4"

Sioux Chief 881-1 – Frequently Asked Questions

1) Will the Sioux Chief 881 knockout test plug work on ABS pipe, or is it PVC only?
Both. The 881 knockout test plug solvent welds to PVC or ABS Schedule 40 DWV pipe, so the same cap works whether the rough-in is run in white PVC or black ABS. The connection is solvent weld only, so you need the correct cement for the pipe material you are bonding to.
2) What does dual-fit mean on the Sioux Chief 881 test cap?
Dual-fit means one cap covers two line sizes. The 881 dual-fit configuration solvent welds over 1-1/2 inch and 2 inch PVC or ABS Schedule 40 pipe, or over 3 inch and 4 inch pipe. For a rough-in crew that means fewer part numbers riding on the truck to cover the same set of openings.
3) Does the 881 plug go inside the pipe or over the outside of it?
Depends which configuration you order. The dual-fit cap solvent welds over the outside of the pipe. The standard knockout version in the 881 series welds directly into the pipe for an internal-fit seal. Pick the external cap when the pipe end is accessible and clean, the internal plug when you need the seal inside the hub.
4) Can I use the 881 knockout plug on Schedule 80 or cast iron drain pipe?
No. The 881 is built to mate with Schedule 40 PVC or ABS DWV pipe and fittings using a solvent-weld bond. Cast iron takes no solvent weld at all, and the plug is dimensioned for Schedule 40. For anything other than Schedule 40 PVC or ABS, use a test plug made for that pipe system.
5) What sizes does the Sioux Chief 881 test plug come in for DWV rough-in testing?
Four knockout sizes: 1-1/2 inch (881-1), 2 inch (881-2), 3 inch (881-3), and 4 inch (881-4). That spread covers the common Schedule 40 drain, waste and vent line sizes on residential and commercial rough-in.
6) How do you remove a knockout test plug after the inspection passes?
You knock it out. Once the DWV line has passed its pressure or air test, the knockout section is driven out so the line can be tied in and finished with no need to cut the pipe or replace the fitting.
7) Is the Sioux Chief 881 test plug sold individually or by the case?
The 881 series is supplied in a 500 EA case pack, sized for distributors and contractors running volume rough-in work rather than one-off repairs.
8) Where is the Sioux Chief 881 test plug made?
The 881 knockout test plug is made in the United States, which matters on public and institutional jobs carrying domestic sourcing requirements.
How fast can I get the Sioux Chief 881-1 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 881-1 come with a warranty?
Absolutely. The Sioux Chief 881-1 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 881-1?
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 881-1 from ZenSupply?
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