Abstract: A method to convert a current round drain structure imbedded within a tiled shower floor with a quadrangular structure includes steps of. Remove drain grate from current round drain structure imbedded within the tiled floor. Insert said quadrangular structure atop the current round drain structure, the quadrangular structure including. A lower section extending downward from the said quadrangular structure a circular cone shaped area defining departure port and a wall section extending upward from the lower section defining wall to contain and hold up a drain grill and a support section extending atop a tile floor outward from the lower section defining horizontal support flanges and the drain grill, square structure having a plurality of holes. Applying bonding layer of thin-set mortar, further including a supplemental tiled shower floor atop, tiled shower floor. Caulking thereby mechanically interlaces the quadrangular structure with a surrounding supplemental tile floor.