3/4" Floor Flange, Home TZH Malleable iron Pipe Fittings for Industrial vintage style, Flanges with Threaded Hole for DIY Project/Furniture/Shelving Decoration (10 Pack) - Amazon.com
RELIABILT 3/4-in Black Floor Flange in the Black Pipe & Fittings department at Lowes.com
Black Pipe Fittings - 3" NPT Floor Flange, 150# UL/FM