Plug-type coupling with pre-assembly locking

A connector for connecting at least one first fluid line to a second fluid line designed with a mating connector or for connecting a sub-assembly designed with a mating connector, comprising:

• a housing with a through-channel, wherein one end of the housing is designed as a sleeve section with a receiving channel which is fluidically connected to the through-channel for receiving an adapter sleeve, the adapter sleeve configured to be inserted into the receiving channel of the sleeve section in an assembly direction which is oriented axially with respect to an assembly axis and is held detachably in an axial direction in the receiving channel, wherein the adapter sleeve having a through-opening designed for a plug shaft of the mating connector, a retaining means mounted onto the adapter sleeve for the detachable fixing of the mating connector to the adapter sleeve, wherein the retaining means protrudes into the through-opening in a resting state and is radially elastically expandable with respect to the assembly axis in a tensioned state, and the plug shaft of the mating connector being configured to be inserted into the through-opening of the adapter sleeve in a pre-assembly position of the connector, and in an assembled state of the connector the retaining means can block the mating connector axially with respect to the assembly axis, wherein a locking element being axially movable with respect to the assembly axis is arranged in a movable manner on an outer circumference of the sleeve section from a release position which releases the retaining means into a locking position which locks the retaining means, wherein the locking element in its release position in the pre-assembly position of the connector is fixed on the sleeve section at least axially against movement into the locking position;
• and
• a positive-locking element extending around the adapter sleeve and that fixes the adapter sleeve in the receiving channel in an axial direction with respect to the assembly axis and protrudes into the through-opening in a resting state preventing disengagement of the adapter sleeve from the sleeve section and is designed to be elastically expandable in a tensioned state in a radial direction with respect to the assembly axis permitting disengagement of the adapter sleeve from the sleeve section.