Sioux Chief 881-4 is a 4" knockout test plug.
During rough-in, the new drain, waste and vent piping is usually filled with water or pressurized with air so the inspector can check for leaks. Test caps and plugs close the open pipe ends and fittings for that test.
A knockout test plug is installed in a 4" DWV line or fitting to hold the test, then knocked out once the inspection is passed so the line can be opened. Match the plug to the nominal pipe size and follow local inspection practice.
Specifications
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Brand: Sioux Chief
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Manufacturer Part #: 881-4
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Product Type: Knockout test plug
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Size: 4"
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UPC: 739236302441
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Category: Cleanouts
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Shipping Weight: 0.054 lb
See also: cleanouts, drains and drainage, air and water test equipment, all Sioux Chief.