for releasing the connection the sleeve 7 is rotated when doing so the securing ribs 13 move with their slanted flanks 14 onto correspondingly slanted flanks of the cams 22 at one end of the bending resistant sleeve segments 9 and widen the sleeve 7 in this rotational angle position the sleeve 7 together with the end section 3 and the flexible fluid conduit 1 can be removed from the end section 4 the sleeve 7 can also be pre mounted on the end section 3 in the position illustrated in fig1 and finally can be coupled with the end section 4 and the fluid conduit 2 connected thereto in an angular position in which the elastic sleeve segments 12 are aligned with the cams 25 in order to connect the fluid conduits 1 2 with one another the stop rib 17 not only provides a limitation for the insertion depth of the end sections 3 4 into the sleeve 7 but also a sealing action at the connecting location of the end sections 3 4 in addition to the sealing action of the sealing ring 8 the flanges 23 24 are provided with ribs so that they provide enhanced grip in order to be able to hold the.