portion 4 the conical portion 4 is inserted in the hole 6 referring to fig1 connectors for pressurized fluids are depicted fig3 and 4 correspond to fig1 and 2 the difference being that the device 1 is shown as provided with electrical connectors 7 7 u2032 and 8 8 u2032 and with a fastening bracket 9 to fasten the body 2 to a manipulator as can be seen in fig1 and 3 there is a plurality of balls on the conical part 4 of the male portion 4 which are arranged circumferentially at even pitch at the same height the balls 11 are housed in appropriate seats obtained in the wall of the conical part 4 the balls 11 are designed as locking means to lock the female portion 5 on the male portion 4 as a matter of fact the balls 11 are movable selectively and by command between an unlocked position radially nearer to the vertical symmetry axis x of the conical part 4 and a locked position radially farther from such axis x at the hole 6 of the female portion 5 a throat is obtained or better a plurality of niches or grooves 12 in which a ball 11 can be inserted at least in part when it is in the locked position the niches 12 are tapered so that to define an undercut with the balls 11 and to prevent the female portion 5 from.