PVC Water Supply Pipe Wall Mount Floor Flange Fittings ID 20-100mm Solvent Weld | eBay
Duct Connector Flange 4 Inch, Plastic Straight Pipe Flange for Heating Cooling Ventilation System (4") - Amazon.com
SteelTek 3/4-in Structural Black Flange in the Structural Pipe & Fittings department at Lowes.com
The Plumber's Choice 1-1/2 in. Floor and Ceiling Plate Cover Split Flange, PVC Escutcheon Plate, Universal Design, White (5-Pack) 243334-QX-5 - The Home Depot
PlumBest C54402R 3 4-Inch PVC Offset Closet Flange with Plastic Swivel Ring Less Knockout, White - Faucet Flanges - Amazon.com