Clutch device, crankcase ventilation device and fresh air system

摘要

The present invention relates to a coupling device for connecting a first fluid line to a second fluid line, with a first connection piece, which has an outer locking contour on its outside and which is connected or can be connected to the first fluid line, to a second connection piece, which is on its outside has an outer locking contour and which is connected or can be connected to the second fluid line, and with a sleeve (4) into which both connecting pieces can be inserted at opposite ends and which has on the inside complementary inner locking contours (10, 11) to the outer locking contours, which lock into place with the external locking contours when the sockets are inserted. The functional reliability is increased if the sleeve (4) is covered by a protective cover (25).