a carrier sleeve 91 fig8 of the type shown in u s pat no 4 830 187 in european wash down water closets the carrier sleeve 91 can be omitted however the top portion 18 is preferably cut or ripped fig9 to permit evacuation of confined waste during the flushing process the envelope 12 14 is deposited in a toilet bottom portion first the convergent shape of the pouch 10 and the non obtrusive adhesive wafer 38 enable the envelope 12 14 to flow in streamlined fashion through the toilet passages and sewer pipes it has been found that flushability of the pouch 10 is enhanced when the pouch has a 15 u00b0 to 25 u00b0 angle of convergence and the width and pouch height are in the size ranges previously specified the removed coupling ring can be separately discarded in a garbage container or reused on a replacement envelope 12 14 that has an adhesive wafer 38 covered by silicone release paper the release paper is thus removed and the coupling 32 installed the replacement pouch 10 can then be interlocked with the coupling 60 on the abdominal wall 13 some advantages of the present invention evident from the foregoing description include an ostomy pouch that has a molded plastic coupling ring that can be removed from the pouch envelope to facilitate flush disposal of the envelope in a water saver toilet removal of the coupling ring is easily accomplished by peeling from the pouch wall the removed coupling ring can either be reused or discarded the pouch envelope can be supplied to the user without the coupling ring so as to permit reuse of a single coupling ring the v shaped profile of the pouch the thin walled structure.