Closet Flange Extension Kit - Corporation Includes one open and one closed socket. Open socket allows you to install the sockets before inserting a closet rod., Fits 1-14 in., to 1-516 in., diameter pole. Used to support closet rods. Closet Flange 3" DWV Brass - Corporation Wht Closet Flange Set Up Diagram A cast iron closet flange for connecting water closets to a pipe which utilizes a collar squeezing a resilient gasket against the pipe Includes one open and one closed socket Features. Oatey 43585 Closet Flange, 3 in Connection, PVC, White, For: Most Toilets Includes mounting screws for easy installation