The plug connection (1) has a holding member (11) for the locking device (30) at the insertion hole (4). The holding member has an axial through hole (12) which connects on to the insertion hole. The insertion part (6) of the pipe (3) passes through the axial through hole and inserts into the connection device (1). The holding member has a part (13) which passes in the first part (7) of the insertion hole, and is fixed there through deformation of the connection device.
