: In the basement of my cabin the soil pipe was not left extended up from the slab! In other words, the top of the pipe is level with the floor. I am putting a basement floor in of 2/4's laid flat and then 3/4 inch plywood underlayment. I would prefer not to use a closet flange extension kit but buy a closet flange where the arm that fits into the soil pipe is long enough (4 inches or so) so I can bolt the flange directly to the plywood. I haven't been able to find such a flange and would appreciate any suggestions.
I would recommend using a coupling and a male (spigot) closet flange...should be about right.