System comprising connecting piece and hose

The invention relates to a system comprising a connection fitting (10) and a media-conducting line (20), wherein the connection fitting (10) has a connection region for a line end of the media-conducting line (20). According to the invention, it is provided that the outer circumferential surface of the connection region has profiling means (13, 16, 46; 11, 17, 18, 30-33, 47c, 47d, 48, 50-52) which interact with a line inner surface of the line end by the profiling means and the line inner surface self-sealingly interlocking with one another. The profiling means (13, 16, 46) have at least one microstructure which is designed as a recess (13) in the outer circumferential surface. Preferably, a plurality of spherical segment-shaped recesses (13) are provided, which are arranged distributed over the connection region, in order to achieve a corrugated surface topography of the outer circumferential surface of the connection region, whereby an artificially produced surface roughness provides a self-sealing tight fit of the line through microlocking with the inner surface of the line. (Fig. 1)