7 includes suitable picking up means 71 which are supported by a relative working head 72 and which are aimed at picking up the group of four caps from the conveying belt 50 at transferring them above the conveying line l in a region above the group of four bottles and at coupling the caps to the bottles sensor means not shown in the proposed figures are also situated in the manipulation station sa interfaced with the robotized handling device 7 the sensor means are aimed at checking the exact matching of the reciprocal position between the group of four caps and the relative group of four bottles in case the sensor means detect the exact matching between the caps and the bottles the robotized handling device 7 is activated to couple the caps with the bottles otherwise if exact matching is not detected due to for example the lack of one cap on a protrusion the conveying belt is activated to place a subsequent group of other four caps in the manipulation station sa if the bottle neck is to be coupled at the same time with a stopper and a cap the proposed device d includes as in the embodiment shown in the enclosed figures two conveying belts 50 arranged side by side and aimed at passing by the respective terminal sections of as many outlet channels of corresponding vibrating bowls a in this particular circumstance the two conveying belts 50 have a different longitudinal extension and they are equipped with respective protrusions of different shapes.