I recently hired a plumber to install shut off valves in a bathroom I am renovating. In the process he took it upon himself to replace the drain lines including the toilet drain. He replaced a 4 inch pipe back to the main drain with a 3 inch pipe which he roughed in to the bathroom. I am now trying to place a new flange on the new pipe and realized that the drain on the bottom of the toilet which is quite old, is 3 5/8 outside diameter and proud to the bottom of the toilet by about 1 1/2 to 2 inches and will not fit. My question is this, it there a coupler/reducer that I can use so I can buy a bigger flange to accomadate the toilet drain and still use the new smaller diameter pipe or do I have to go back to a 4 inch drain pipe?
No adapter I am aware of. If you don't want the hassle of arguing with the person that screwed things up, you will probably need to cut the 3" and add a 3x4 reducer below floor level and then install a new 4" flange.
If you have never made a mistake, you haven't done much.