An apparatus and system for reducing the area of exposure of intestinal effluent on a stoma wafer by 90% to 100%. The apparatus consists of substituting the pouch on a ring of a mechanically connecting ring ostomy pouch and wafer assembly by a membrane. An orifice equal to or smaller than a stoma is made in the center of the installed membrane. An insert is passed with open end first through the top end of the membrane orifice, is pulled through the bottom end of the orifice, is overlapped by ¼ to ½ inches on the outer circumference of the mechanically connecting ring of the membrane. The membrane with the insert in position is slid down the stoma via the orifice, and the mechanically connecting ring of the membrane is mechanically connected to the opposite corresponding mechanically connecting ring of a stoma wafer that is adhering to the skin.
