Abstract: In the device, the male connection members (3) are carried by a plate (11) provided with a pair of identical downwardly-extending side prongs, each of the prongs being provided with a recess (101) having a forwardly-facing shaped edge, whereas the female members (4) are carried by an upwardly open housing (2) in which a locking shaft (5) is mounted to rotate and guided in rotation, the shaft being provided with two cam-forming portions (50), each of which is suitable for co-operating with the recessed shaped edge of a respective prong (10). Hydraulic connection, e.g. between a machine and a hydraulic source.