Abstract: An ostomy device for attachment (coupling) to a base plate is disclosed. The ostomy device comprises attachment structures for attachment to a base plate, wherein the ostomy device comprises an attachment ring configured to be detachably attached to the base plate. The ostomy device comprises additional structures provided with attachment elements configured to be detachably attached to the attachment ring. The attachment ring is configured to be detachably attached to the inner side of an attachment recess provided in the locking flange of the base plate.