Patent ID: 7708320

Claim:
Plug connector arrangement, comprising: a plug-in part comprising: a piece of tubing, a sealing portion, said sealing portion comprising a sealing element enclosing the piece of tubing in a circumferential direction, and a locking portion with at least one undercut, the at least one undercut being formed by at least one protrusion which projects from outside of the piece of tubing and extends circumferentially over a sub-region of the piece of tubing, providing the piece of tubing with an asymmetrical cross-section in a region of the at least one protrusion, and a coupling part comprising: a receptacle, into which the plug-in part can be plugged, and a locking device with at least one locking element which, in a locking position, penetrates laterally into a locking region of the receptacle and is adapted to be moved into a release position by means of an actuating element, the locking region having an asymmetrical cross-section which corresponds to the asymmetrical cross-section of the locking portion of the plug-in part in the region of the at least one protrusion, wherein: the plug-in part is adapted to be plugged into the receptacle of the coupling part in order to produce a fluid-tight connection, the at least one locking element of the coupling part engages with the plug-in part in a region of the at least one undercut, and the asymmetrical cross-section secures the plug-in part against rotation when plugged into the receptacle.