A mixer for delivering cold water, hot water and mixed water in sanitary systems, provided with a device for disinfection of legionella. The mixer comprises a hollow body (10) having a cold water inlet (12), a hot water inlet (11), a delivery spout (17), and a mixing cartridge (15) inserted into a sleeve (20, 21) sealingly housed in the body (10) of the mixer. The sleeve comprises a peripheral wall (20) and a transverse wall (21) configured with an annular sealing seat (22) for a valving member (23) arranged coaxially to the cartridge (15), in a branched path (P) between the hot water inlet (11) and the cold water inlet (12). The valving member (23) can be driven from the exterior by a manual tool (35) that is insertable through an aperture (34), closed by a removable cover (25); the tool (35) is configured so as to prevent the extraction thereof during a step of thermal disinfection of the mixer.
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