An auxiliary spray device for dishwashers, comprising: a fitting member for fastening the device directly or indirectly to the washing chamber of a dishwasher, the fitting member comprising a washing liquid inlet portion, and the spray device being designed to rotate about an axis of rotation passing through the fitting member; a plurality of washing nozzles in fluid communication with the inlet portion, the washing nozzles being designed to deliver washing fluid in a direction having a component which is parallel to the axis of rotation and which is greater than the other components; a plurality of propulsion nozzles in fluid communication with the inlet portion, the propulsion nozzles being designed to deliver washing fluid in a direction having a component perpendicular to the axis of rotation, the propulsion nozzles being more distant than the washing nozzles from the axis of rotation; the propulsion nozzles being located on corresponding bevelled and rounded end portions having a profile, in a cross section taken along a plane parallel to the axis of rotation, which is substantially oval; a central body on which the washing nozzles are positioned, the end portions being connected to terminal appendages of the central body; characterised in that the central body has a multi-lobed shape, each lobe of this multi-lobed shape comprising a first portion at the position of the fitting member and a second portion forming a corresponding end appendage of the central body; and in that the auxiliary spray device comprises a plurality of connecting profiles, each connecting profile extending between a corresponding end portion, connected to the second portion of one lobe, and an adjacent lobe, the connecting profiles extending with continuity of shape from the end portions and having a curved extension in plan view. a fitting member for fastening the device directly or indirectly to the washing chamber of a dishwasher, the fitting member comprising a washing liquid inlet portion, and the spray device being designed to rotate about an axis of rotation passing through the fitting member; a plurality of washing nozzles in fluid communication with the inlet portion, the washing nozzles being designed to deliver washing fluid in a direction having a component which is parallel to the axis of rotation and which is greater than the other components; a plurality of propulsion nozzles in fluid communication with the inlet portion, the propulsion nozzles being designed to deliver washing fluid in a direction having a component perpendicular to the axis of rotation, the propulsion nozzles being more distant than the washing nozzles from the axis of rotation; the propulsion nozzles being located on corresponding bevelled and rounded end portions having a profile, in a cross section taken along a plane parallel to the axis of rotation, which is substantially oval; a central body on which the washing nozzles are positioned, the end portions being connected to terminal appendages of the central body; characterised in that the central body has a multi-lobed shape, each lobe of this multi-lobed shape comprising a first portion at the position of the fitting member and a second portion forming a corresponding end appendage of the central body; and in that the auxiliary spray device comprises a plurality of connecting profiles, each connecting profile extending between a corresponding end portion, connected to the second portion of one lobe, and an adjacent lobe, the connecting profiles extending with continuity of shape from the end portions and having a curved extension in plan view.