Connector

The present invention relates to a connector (100) for establishing a fluid connection, comprising an insertion connector (107) for insertion into a connection connector that comprises an externally circumferential groove; a spring (107) for locking the insertion connector (109) to the connection connector, which comprises a first spring section (107-1) for engaging a first side of the groove of the connection connector, a second spring section (107-2) for engaging a second side of the groove of the connection connector and a pressure section (107-3) for pressing the spring (107) in the direction of the insertion connector (109); and a stop (111-1, 111-2) for spreading the first and second spring sections (107-1; 107-2) when the pressure section (107-3) is pressed.