Permanently capping a basement toilet

To cap off a cast iron toilet flange you will need a No hub coupling, inside caulk and gasket are your 3 connection options. You can get these from a local plumbing supply house or do a search online. For a PVC flange: Saw off the pipe below grade with an inside pipe cutter and chip out surrounding cement to allow for cap to be glued on and still be below grade. Or you can remove the flange and cap the waste line if you are not concerned about it sticking above the floor level...