Abstract: The invention relates to an apparatus for administering a medical fluid comprises a film-sheet pouch of a heat-sealed polymeric material, which includes a first chamber containing medical fluid and a second chamber for receiving used medical fluid, and comprises a cross-over conveying device detachably enclosed within a third chamber of the film-sheet pouch that includes a fluid conduit line, having a first end heat-sealed into the bonded seam defining the first chamber and a second end including a connector coupled to a peritoneal catheter. The apparatus of the present invention also includes at least one shut-off element to control the flow of fluid out of the first chamber into the conduit line.