Quick coupling for fluid conduits

The connector (1) has a T-shaped plug (2) comprising a connecting piece (3) protruded from a lead line (4). The connecting piece is inserted into a receiving opening (5) of a counter part (6) and placed over a detent device (7). A protection facility is placed between a secured position in which a locking engagement is secured against the plug, and a release position in which the locking engagement is released from the plug. A fastening device (9) is placed at the protection facility and on a side of the lead line.