Sioux Chief 8782 Slotted Polyp...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.95
Sioux Chief 8782 Slotted Polypropylene Test Plug with Brass Insert

Sioux Chief 8782 Slotted Polypropylene Test Plug with Brass Insert

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Model: SIO878-15

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

$1.95
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Sioux Chief 8782 Slotted Polypropylene Test Plug with Brass Insert

The Sioux Chief 8782, part of the 878 Series, is a slotted test plug built from reinforced polypropylene and fitted with a threaded brass insert, available in sizes ranging from 1-1/2" to 4" to cover standard DWV pipe diameters. Designed for rough-in drain, waste, and vent (DWV) work, this plug seats into ABS or PVC drain, waste, and vent pipe to seal off a line section during pressure or air testing before the system is closed up behind a wall or under a slab. The reinforced polypropylene body resists chemical attack from common drain-line cleaners and solvents and holds up better over repeated use than traditional plug materials, while the slotted design allows the plug to be driven and removed with a standard screwdriver or similar tool on the job site. Whether sizing for a 1-1/2" branch line or a 4" main stack, the 878 Series gives plumbers and contractors a consistent, chemical-resistant test plug across the full range of DWV pipe sizes.

Key Features

  • Size Range: Available in 1-1/2", 2", 2-1/2", 3", 3-1/2", and 4" sizes to match standard DWV pipe during rough-in pressure testing.
  • Durable Construction: Reinforced polypropylene material will not seize up on ABS or PVC pipe, is chemical-resistant, and is more durable than traditional plug materials.
  • Threaded Brass Insert: Includes a threaded brass insert, allowing the plug to accept a test fitting or be removed cleanly without damaging the plug body.
  • Slotted Head: Slotted design for straightforward installation and removal with common hand tools during inspection and testing.
  • Also Available Without Insert: The 878 Series plug is offered with or without the threaded brass insert, depending on job requirements.
  • Repeated Reuse: Built to withstand multiple install-and-remove cycles across jobs without losing seal integrity or structural strength.

Technical Specifications

  • Country of Origin: United States
  • Packaging: 25 EA per package
  • Size Range: 1-1/2" through 4"

Typical Applications

  • DWV Pipe Pressure and Air Testing
  • Rough-In Drain, Waste, and Vent Installations
  • Temporary Sealing of ABS or PVC Lines During Inspection
  • New Construction and Renovation Plumbing Rough-In
  • Multi-Size Jobsite Kits Covering Branch Lines Through Main Stacks

Why Sioux Chief?

Sioux Chief builds the 878 Series test plug from reinforced polypropylene specifically so it won't seize up on ABS or PVC pipe, giving plumbers and contractors a chemical-resistant, repeatedly reusable tool for DWV pressure testing across every common pipe size from 1-1/2" to 4". With the threaded brass insert option and a straightforward slotted design, the 8782 Series is a practical, job-site-ready solution for sealing rough-in drain lines before they're closed in behind the wall, and its consistent construction across the full size range means contractors can standardize on one reliable test plug family for the entire job.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Test Plug
Configuration:
Slotted with Brass Insert
Country of Origin:
United States
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves
Product Material:
Polypropylene
Product Size:
4"

Sioux Chief SIO878-15 – Frequently Asked Questions

1) What pipe sizes does the Sioux Chief 878 slotted test plug come in?
Six sizes cover standard DWV pipe: 1-1/2 inch (878-15), 2 inch (878-20), 2-1/2 inch (878-25), 3 inch (878-30), 3-1/2 inch (878-35), and 4 inch (878-40). That spans a 1-1/2 inch lavatory branch line up to a 4 inch main stack, so one plug family handles the whole rough-in.
2) Will the Sioux Chief 8782 test plug work in both ABS and PVC drain pipe?
Yes. The 8782 seats into ABS or PVC drain, waste, and vent pipe, and the reinforced polypropylene body is specifically chosen so it won't seize up on either material when you go to pull it back out.
3) What is the brass insert on the Sioux Chief 8782 test plug actually for?
The insert is a threaded brass fitting in the center of the plug. It lets the plug accept a test fitting, and it gives you a solid thread to pull against so the plug comes out cleanly instead of tearing up the plastic body. The 878 Series is also offered without the insert if you just need a plain seal and nothing to connect to.
4) Do I need a special tool to set or pull a slotted DWV test plug?
No. The 878 head is slotted, so a standard screwdriver or similar flat tool drives it in and backs it out on the job site. That is the practical difference from a mechanical expanding plug, which needs a wrench on a nut to set the gasket.
5) Can I reuse the Sioux Chief 878 test plugs on the next job or are they throwaways?
They are built for repeated install-and-remove cycles without losing seal integrity or structural strength, which is the point of the reinforced polypropylene body over traditional plug materials. The brass insert helps here too, since you are pulling on metal threads rather than levering on plastic.
6) Are Sioux Chief 878 test plugs sold individually or by the box?
Packaging is 25 each per package, so these come as a jobsite quantity rather than a single plug. Contractors stocking a truck typically buy a couple of the common sizes, 2 inch and 3 inch, plus 4 inch for stacks.
7) Will drain cleaner or solvent sitting against the plug damage it?
The reinforced polypropylene body resists chemical attack from common drain-line cleaners and solvents, so residual PVC primer, cement, or cleaner in a freshly glued line won't soften the plug the way some plug materials do.
8) What is the Sioux Chief 878 plug used for during rough-in?
It temporarily seals off a section of DWV line so the system can be pressure or air tested before it is closed up behind a wall or under a slab. Typical uses are new construction and renovation rough-in, and holding a line for inspection sign-off. It is a test tool, not a permanent cap, so it comes back out once the test passes.
How fast can I get the Sioux Chief SIO878-15 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 SIO878-15 come with a warranty?
Absolutely. The Sioux Chief SIO878-15 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 SIO878-15?
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 SIO878-15 from ZenSupply?
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