Abstract: An assembly for the selective supply of detergents or the like to the washing drum of a washing machine comprising a drawer (23) for holding detergents having a fixed body (32) and a mobile portion (33) provided with at least a first and a second compartment (34, 35) for containing a respective detergent, said fixed body (32) having at least a first and a second inlet member (34a, 35a) for a flow of liquid for removing the detergent from a respective compartment (34, 35) which is then discharged enriched with detergent into the washing drum of the washing machine, and a valve device (38) comprising a collector pipe (39) for collecting the flow of liquid for removing the detergent and at least a first and a second valve element (44, 45) each having a respective bowl (44a, 45a) leading into said collector pipe (39) and a respective outlet member (44d, 45d) for emission of a respective flow of liquid towards a corresponding inlet member (34a, 35a) of the detergent drawer (23).