Sioux Chief 883-PT 3" x 4" PVC Closet Flange with Test Knockout

Sioux Chief 883-PT 3" x 4" PVC Closet Flange with Test Knockout

The Sioux Chief 883-PT is a 3" x 4" PVC closet flange engineered for toilet (water closet) rough-in installations. Molded from durable PVC for direct compatibility with PVC drain-waste-vent piping, this flange features a Test Knockout (TKO) design that lets the installing plumber use the fitting as a temporary test cap during rough-in inspection, then knock it out to open the waste line for the final toilet connection. Manufactured in the United States, the dual 3" x 4" hub sizing lets installers mate the same flange to either 3" or 4" PVC drain pipe, which cuts down on the number of flange SKUs a rough-in crew has to stock for mixed pipe sizes on a job site. Each unit ships 25 EA per case for distributor and contractor restocking.

Key Features

• Trade Size: 3" x 4" hub connection lets one flange accept either 3" or 4" PVC drain pipe, reducing the number of part numbers needed on the truck.
• Durable PVC Construction: Molded PVC body resists corrosion from wastewater exposure and solvent-welds directly into PVC DWV pipe runs.
• Test Knockout (TKO) Design: A removable knockout plug lets the flange double as a temporary test cap while the rough-in is pressure or water tested, then knocks out cleanly to open the waste line for the toilet connection without swapping fittings.
• Closet Flange Type: Purpose-built to anchor a toilet (water closet) to the floor drain pipe, giving the closet bolts a solid mounting point and supporting the wax ring seal.
• Country of Origin: Manufactured in the United States.
• Packaging: Supplied 25 EA per case for stocking distributors and rough-in crews.

Technical Specifications

• Country of Origin: United States
• Packaging: 25 EA per case
• Trade Size: 3" x 4"
• Material: PVC
• Feature: Test Knockout (TKO)

Typical Applications

• Toilet (Water Closet) Rough-In Installation
• Residential and Commercial Bathroom Plumbing
• New Construction and Remodel Rough-In Plumbing
• PVC Drain-Waste-Vent (DWV) Pipe Connections
• Distributor and Contractor Stock for Mixed 3" / 4" Pipe Jobs

Why Sioux Chief?

Sioux Chief backs the 883-PT with solid PVC construction and a practical Test Knockout design that lets one flange handle rough-in inspection and the final toilet hookup without a fitting change. The dual 3" x 4" hub sizing gives plumbers and rough-in crews flexibility to standardize on a single closet flange across jobs that mix 3" and 4" PVC drain pipe. Manufactured in the United States and packed 25 EA per case, it is a straightforward, job-ready closet flange built for PVC DWV rough-in work.