CHARLOTTE PIPE 4X3 DWV Closet Flange HUB DWV (Drain, Waste and Vent) (1 Unit Piece): Amazon.com: Industrial & Scientific
Bernkot 2 Inch Shower Drain Base Kit PVC Sub Drain with Shower Drain Base Flange Threaded Adaptor and Rubber Coupler Gasket for Square/Linear Shower Drain Installation, PVC - - Amazon.com