Connector (10) for enabling fluid transfer between a first fluid container (28) and a second fluid container, which connector (10) comprises a first component (12) that is arranged to be connected to a first fluid container (28) and a second component (14) that is arranged to be connected to a second fluid container. The first component (12) is arranged to be non-rotatably connected to said second component (14) before a second fluid container is connected to said second component (14) and/or before a first fluid container (28) is connected to the first component (12). The connector (10) comprises a locking and rotation-enabling element (16) that is arranged to be activated once a second fluid container has been connected to said second component (14), and/or once a first fluid container (28) has been connected to the first component (12), which locking and rotation- enabling element (16) enables the first component (12) and the second component (14) to rotate freely with respect to one another.
