Abstract: The present invention concerns an apparatus, in particular a cover for a rotor (51), for the initiation of the spinning of a thread in an open-end spinning apparatus (1), which apparatus possesses a fiber feed conduit (6) which extends from a disintegrating apparatus (4) to a spin rotor (50), which is installed in a rotor housing (5) in combination with a controllable vacuum source, and which rotor (50) is covered with a rotor cover (51) which also accepts the fiber feed conduit (6), at least partially. The apparatus exhibits further a service wagon (2) for the open-end spinning apparatus (1), which wagon carries a suction line (20) to a connection piece (7) of the open-end spinning apparatus (1). The connection piece (7) is in communication with a connection opening (70) in the fiber feed conduit (6) and is in a break-away sealed connection with the rotor cover (51).