A handling device for connections between data transmission cables, especially for fiber optic connections between fiber optic cables, comprising: a fixture; a plurality of adapter modules mountable side by side in a first direction on the fixture, whereby the or each adapter module is individually removable from the fixture and individually mountable on the fixture, whereby the or each adapter module comprises a basic body for holding at least one adapter, and whereby the or each adapter is configured to hold connectors and connect data transmission cables at a rear side and a front side of the respective adapter module; wherein the basic body of the or each adapter module has holding legs (21, 22), each holding leg (21, 22) of the respective adapter module has a first end and a second end, the holding leg (21, 22) of the respective adapter module are pivotably and flexibly connected in a middle portion of the same, the second ends of the holding legs (21, 22) of the respective adapter module provide gripping elements for manually actuating and thereby pivoting the same, whereby in a first, manually un-actuated position of the holding legs (21, 22) the same run in general parallel to each other so that the respective adapter module can be held on the fixture in the first position, and whereby in a second, manually actuated position of the holding legs (21, 22) the same are pivoted with respect to each other so that the respective adapter module can be mounted on the fixture or removed from the fixture in the second position the handling device being characterised in that the holding legs (21, 22) of the respective adapter module define openings for receiving and holding the or each adapter, wherein a first holding leg is assigned to a rear side of the respective adapter module and second holding leg is assigned to a front side of the respective adapter module. a fixture; a plurality of adapter modules mountable side by side in a first direction on the fixture, whereby the or each adapter module is individually removable from the fixture and individually mountable on the fixture, whereby the or each adapter module comprises a basic body for holding at least one adapter, and whereby the or each adapter is configured to hold connectors and connect data transmission cables at a rear side and a front side of the respective adapter module; wherein the basic body of the or each adapter module has holding legs (21, 22), each holding leg (21, 22) of the respective adapter module has a first end and a second end, the holding leg (21, 22) of the respective adapter module are pivotably and flexibly connected in a middle portion of the same, the second ends of the holding legs (21, 22) of the respective adapter module provide gripping elements for manually actuating and thereby pivoting the same, whereby in a first, manually un-actuated position of the holding legs (21, 22) the same run in general parallel to each other so that the respective adapter module can be held on the fixture in the first position, and whereby in a second, manually actuated position of the holding legs (21, 22) the same are pivoted with respect to each other so that the respective adapter module can be mounted on the fixture or removed from the fixture in the second position the handling device being characterised in that the holding legs (21, 22) of the respective adapter module define openings for receiving and holding the or each adapter, wherein a first holding leg is assigned to a rear side of the respective adapter module and second holding leg is assigned to a front side of the respective adapter module.