Unit for supplying liquid (3) intended to be mounted in an instrument of the projection of liquid, said unit comprising: - a cartridge of liquid (6), and - a liquid spray head (7) connected to the cartridge of liquid (3) [unit for supplying liquid (3) also comprises a power supply source (8) integral with the cartridge of liquid (6) to form a power supply unit (3) pre - assembled intended to be mounted directly in the instrument of the projection of liquid.
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