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: An end section of a plastic fluid line with a push-in fitting is injection molded on coaxially for sealed push-in connection to a mating element of complementary shape with the aid of a securing element which transmits axial forces. The assembly formed of an end section and push-in fitting has a first circumferential groove on the end section, in the region of which the push-in fitting is molded on with form-fitting penetration of the plastic of the push-in fitting into the first circumferential groove. The end section, in the joining direction of the push-in fitting, protrudes axially beyond the latter and has a second circumferential groove for receiving a sealing ring. A third circumferential groove for receiving the securing element is molded into the push-in fitting on the outer circumference thereof.

Abstract: An end section of a plastic fluid line with a plastic push-in fitting is molded on coaxially by injection molding for sealed push-in connection to a mating element of complementary shape with the aid of a securing element which transmits axial forces. The assembly formed of end section and push-in fitting has a first circumferential groove on the end section, in the region of which the push-in fitting is molded on with form-fitting penetration of the plastic of the push-in fitting into the first circumferential groove. The end section, in the joining direction of the push-in fitting, protrudes axially beyond the latter, and in that region, has a second circumferential groove for receiving a sealing ring. A third circumferential groove for receiving the securing element is molded into the push-in fitting on the outer circumference thereof.

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.