Patent ID: 8899628

Claim:
A component of a plug-in connection for media-carrying lines, comprising: a coupling have a flow channel through the coupling, an inner cross-section of the flow channel being enlarged in steps in order to form a reflux zone when carrying the media, wherein a line-side end of the flow channel includes a passage for media flow to or from a first one of the media-carrying lines and a contracted outer surface for connection with and fastening to the first one of the media-carrying lines, a connection-piece end of the flow channel includes a passage for media flow to or from a mating connection-piece of a second one of the media-carrying lines, the media passage of the connection-piece end having a central axis that is parallel to a central axis of the media passage of the line-side end, and the connection-piece end having an outer-side receiving contour configured to receive a media-carrying line retaining spring and having a smooth inside surface configured to receive a sealing ring for sealing an annular space between the smooth inside surface and the mating connection-piece of the second one of media-carrying lines, the reflux zone is located between the line-side end and the connecting-piece end, the media flow passages of the line-side end and the connecting-piece end have smaller cross-sectional areas than a cross-sectional area of the reflux zone, the cross-sectional area of the media flow passage of the line-side end is smaller than the cross-sectional area of the media flow passage of the connection-piece end, the reflux zone is asymmetrically formed over a circumference of the inner cross-section of the flow channel such that a central axis of the reflux zone is not co-axial with the central axis of the media passage of the line-side end, at least one vent opening to a region outside the media-carrying lines is formed in at least one of the reflux zone and steps between the reflux zone and each of the line-side end media passage and the connection-piece end media passage, and the coupling includes an inner surface in the flow channel that is continuous between the reflux zone and each of the line-side end media passage and the connection-piece end media passage except for the at least one vent.