Abstract: A rectal-colon dilator and fecal collector assembly having a tubular member with a meltable cap at one end and an external base member for supporting the tubular member at its other end. The base member has a circular aperture communicating with the tubular member, and a collector bag is connected to communicate with the aperture in sealing relation. A flange around the tubular member near its outer end has screws that engage circular slots in the base member for clamping these parts together by simple rotation of the tubular member with respect to the base member. The base member is saddle-shaped to conform to the patient's body. Upon insertion of the tubular member, peristalsis and defecation are effected in the patient, and fecal matter passes out through the tube and into the collection bag.