Doing a little bathroom remodel, including putting in a subfloor. The current floor is concrete, and the toilet sits directly on the floor, as near as I can tell. I'm going to need to raise the flange up 2 1/4" to be level with the floor. I'm not sure if there'll be any way to extend the current pipe up, as I suspect that it's set into the concrete. Are there fittings available to attach to a flange, and install another flange above that? Or should I get out the sledge and replumb the whole flange to the level of the floor?