The mouth of the terra cotta or clay drain pipe is about a diameter. The holes to mount a typical flange line up with the lip of the clay pipe and it wouldn't hold the flange. The top section of the clay pipe had to go. Chip it out down to the lower lip using a cold chisel and a hammer. You laid ceramic tile in the interim, so be careful not to chip that. Also, cover the lower portion of the drain pipe with duct tape so none of the clay fragments went into the sanitary sewer.

The upper portion of the clay drain pipe is gone. Don't forget to wear safety glasses when forcefully chipping out sharp pieces of clay! The lower section is about a diameter - perfect for accepting a piece of drain pipe. Use the yardstick to mark floor level.

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