The invention relates to a plug connector (300), having: a receiving element (10) for receiving a plug-in element of the first type (100) or a plug-in element of the second type (200) at least in certain areas; and - a push-pull locking system (20) for producing a push-pull locking between the connector (300) and the plug-in element of the first type (100); wherein the push-pull locking system (20) has at least one locking element (13) which is arranged at least regionally in a recess (14) of the receiving element (10) provided for the at least one locking element (13), and wherein the receiving element (10) has at least one latching means (12) which is provided and designed to with at least one complementary latching means (230) of the plug element, of the second type (200) to be brought into engagement.