Abstract: A pipeline plug-in connection (10) has a receiving part (14), a plug-in part (16) which can be plugged into the receiving part (14), a sealing element (18) for sealing between the receiving part and the plug-in part, and an elastic securing element (20). The plug-in part has a pipe section (50) with an abutment (24) with an expanding diameter section (26) which expands in terms of its external diameter counter to the joining direction, over which expanding diameter section the securing element can be stretched, and an abutment face (28), behind which the securing element can latch. The expanding diameter section ends, with its largest external diameter substantially near or at the abutment face, wherein a flange (54) is formed on the pipe section, the flange forming a sealing face (56) at the end, against which sealing face the sealing element bears in a sealing manner when the plug-in connection is assembled.

Abstract: A plug-in connection (10) for pipelines (12) comprises a receiving part (14), a plug-in part (16) which can be plugged into the receiving part (14), a sealing element (18) for sealing between the receiving part and the plug-in part, and an elastic securing element (20) for securing the plug-in part to the receiving part. The plug-in part has a pipe section (50) with an abutment (24) comprising an expanding section (26) which expands in terms of its external diameter counter to the joining direction, over which expanding section the securing element can be stretched, and an abutment face (28), behind which the securing element can latch and which supports the plug-in part on the securing element to prevent unintentional release.