The present disclosure relates to an in-the-ear part having a closing assembly. The in-the-ear part configured to be attached to a hearing device. The in-the-ear part having a cavity for holding an output transducer and the in-the-ear part having an opening and the closing assembly being configured to fit into the opening. An insert part having an inset part opening for receiving and mounting a connecting member is also mounted to the in-the-ear part, the connecting member configured for mechanically coupling the in the ear part to a behind the ear part of the hearing device. A cover part is further provided, which comprises a recess for receiving and mounting the insert part to the in-the-ear part.