A device for the discharge of a pasty two-component mixture includes a supply container with two chambers, each chamber for containing one component of the two-component mixture and having an outlet stub for connecting to a mixer unit. The mixer unit includes a coupling end having two inlet stubs which form two channels leading into a mixer element, and on an opposite end, an outlet opening. A rotatable holding shell is provided in a substantially surrounding relationship to the two outlet stubs and includes a recess of a shape substantially identical with the cross sectional shape of the coupling end of the mixer housing.