Patent ID: 8485228

Claim:
Plug-in part for a plug connector arrangement, said 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 two protrusions which project from outside of the piece of tubing and extend 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 locking portion, wherein: the plug-in part is adapted to be plugged into a receptacle of a coupling part of the plug connector arrangement in order to produce a fluid-tight connection, the plug in part is adapted to receive at least one locking element of the coupling part in a region of the at least one undercut, the asymmetrical cross-section secures the plug-in part against rotation when plugged into the coupling part, the two protrusions are located diametrically opposite one another and are connected to one another via flattened circumferential portions of the locking portion, and the two protrusions extend radially from the piece of tubing to a greater extent than the flattened circumferential portions.