Abstract: A one piece shower drain pan, encapsulated in a water proof membrane, wherein one embodiment provides a one piece shower pan which includes a recessed drain portion supporting a square insert made of pvc or poly vinyl material which includes a plurality of drain channels extending from the outer edge of each wall of the insert into the recessed drain portion. The insert would be covered by tile members similar to the tiles of the shower floor, so to provide the visual effect of no drainage opening in the floor of the shower. There would be provided a perimeter water flow space between the side edges of the tiles covering the insert and the edges of the surrounding tiles, so that water flowing onto the floor of the shower would flow through the perimeter water flow space, through the drain channels and into the main drain.