A liquid diffusing device with interchangeable nozzles includes a support frame having a passageway for the liquid to be diffused, with an inlet and an outlet, at least one nozzle having a liquid outlet section with a predetermined diameter and a corresponding outflow rate, which is removably and selectively attachable to the outlet in a predetermined operating position, and a system for supporting at least one additional nozzle having an outlet section of a diameter other than that of the first nozzle in the non-operating position. The support system comprises a nozzle-holding plate formed of one piece with the frame and having quick a connect/disconnect system for the additional nozzle in the non-operating position.
