A dish-washing machine having: a washtub, in which there can be housed at least one lower dish rack and one upper dish rack; and a sprinkler system, which comprises a lower sprinkler device configured for spraying water upwards, towards the lower rack, and at least one of an intermediate sprinkler device, configured for spraying water upwards, towards the upper rack, and an upper sprinkler device, configured for spraying water downwards, towards the upper rack, the lower sprinkler device and the at least one of the intermediate sprinkler device and the upper sprinkler device comprising respective rotary sprinklers, the at least one of the intermediate sprinkler device and the upper sprinkler device being supplied via a canalization having at least one first portion and one second portion, and possibly one third portion, which extend substantially at a lower wall, a rear wall, and an upper wall of the tub, respectively, wherein the sprinkler system comprises at least one further stationary sprinkler device within the tub, configured for spraying water towards one of the lower rack and the upper rack,, wherein the further stationary sprinkler device has a hollow body with a coupling portion in fluid communication with a duct (14, 15) of the canalization, characterized in that the coupling portion of the hollow body is fitted on a corresponding intermediate coupling portion of the canalization and has, on a rear side thereof facing the canalization, at least one of quick mechanical-coupling means and quick hydraulic-coupling means coupled to corresponding quick mechanical-coupling means, respectively quick hydraulic-coupling means, provided in said intermediate coupling portion of the canalization. a washtub, in which there can be housed at least one lower dish rack and one upper dish rack; and a sprinkler system, which comprises a lower sprinkler device configured for spraying water upwards, towards the lower rack, and at least one of an intermediate sprinkler device, configured for spraying water upwards, towards the upper rack, and an upper sprinkler device, configured for spraying water downwards, towards the upper rack, the lower sprinkler device and the at least one of the intermediate sprinkler device and the upper sprinkler device comprising respective rotary sprinklers, the at least one of the intermediate sprinkler device and the upper sprinkler device being supplied via a canalization having at least one first portion and one second portion, and possibly one third portion, which extend substantially at a lower wall, a rear wall, and an upper wall of the tub, respectively, wherein the sprinkler system comprises at least one further stationary sprinkler device within the tub, configured for spraying water towards one of the lower rack and the upper rack,, wherein the further stationary sprinkler device has a hollow body with a coupling portion in fluid communication with a duct (14, 15) of the canalization, characterized in that the coupling portion of the hollow body is fitted on a corresponding intermediate coupling portion of the canalization and has, on a rear side thereof facing the canalization, at least one of quick mechanical-coupling means and quick hydraulic-coupling means coupled to corresponding quick mechanical-coupling means, respectively quick hydraulic-coupling means, provided in said intermediate coupling portion of the canalization.