Device for coupling containers

In a device for coupling two containers for transfer of contents therebetween, said device including a separate connecting branch having essentially a circular cross section corresponding to each of the containers, each connecting branch having a closing member having an essentially circular cross section being located adjacent to an end face thereof and having an outside diameter essentially corresponding to the inside diameter of the connecting branch, each closing member being rotated through 90.degree. from a closed position wherein the closing member essentially extends transversely relative to the longitudinal center axis of the connecting branch to an opened position where it is essentially parallel to the longitudinal center axis of the connecting branch, the improvements comprising each of the closing members having a semiaxle being seated by, respectively, two bearing shells lying opposite one another and complimentary with respect to the semiaxle that opens toward the end face of the respective connecting branch, said end faces being aligned in a closed position when the end face of each respective connecting branch face each other and are seated against each other with the respective semiaxles, each semiaxle has an essentially semicircular cross section, with planar end faces, that face away from the container including the respective connecting branch, and are essentially aligned with the end faces of each closing member facing away from the container corresponding therewith, only one of said semiaxles being directly engaged by a valve actuator and with the end faces of the connecting branches being pressed against one another in an aligned fashion with the closing members being arranged to form a single combined closing member, the other closing member not directly driven by the valve acuator being entrained to pivot in the bearings formed by the bearing shells and being pivotable between the closed position and opened position with the first closing member connected to the valve actuator and wherein said end faces include means for retaining each closing member within each respective connecting branch when said connecting branches are uncoupled.