Abstract: The apparatus for carrying out a mixing dispensing of a plurality of flowable components from a multiple chambered vessel (2) comprises the following parts:a housing (1) which can be placed onto the vessel and has an outlet opening (12), a transition part (11) which can be coupled on to the vessel and a tubular part (10) between the transition part and the outlet opening;a static mixer (4) consisting of a structure which can be pushed into the tubular part;a transition piece (3) which is arranged in the transition part, which produces separate supply passages (31, 31') from outlet openings (21, 21') of the vessel to the mixer structure (4) and which permits a flowing of the components only through these supply passages;and furthermore a coupling-on means (15) for the releasable securing of the housing to the vessel.