Abstract: A connecting device is for pneumatic apparatus intended particularly to control the distribution of fliuds passing to receptor apparatus. The body (1) of each apparatus can be coupled to that of an identical or analogous apparatus, placed upstream or downstream, by orientatable screws (45) placed in housings opening in the region of faces (5,6) coming into contact during association (25,26). This device is applicable to all apparatus intended to constitute a group of identical apparatuses, and is applied advantageously to the construction of an assembly for the control of jacks.