An assembly (10) includes a first connector (12), and a second connector (14) mobile in axial translation relative to the first connector, a first part (16) attached to the first connector, and a first sleeve (18) axially rotatable relative to the first part between a first plurality of positions, a first blocking device (20) blocking the first sleeve, a second part (22) attached to the second connector, and a second sleeve (24) axially rotatable relative to the second part between a second plurality of positions, a second blocking device (26) blocking the second sleeve. The first sleeve, the first part, the second sleeve, and the second part have shapes that provide a coding that allows connection only if the position of the first sleeve matches the position of the second sleeve.