A multiple nozzle holder assembly with increased operating flexibility, comprising a main body provided with an inlet for a working fluid and with at least two outlets for the fluid, the inlet having a fluid connection to each outlet by means of a respective passage duct that is sectioned by corresponding valve elements for flow control with automatic actuation, an additional body being provided with at least three couplings for connection to respective atomizing nozzles, which is associated with the main body so that it can move among several operating configurations, at least two of which are delivery configurations in which selectively at least two of the at least three couplings each have a fluid connection to one of the at least two outlets.