Automatic distributor device using a metering pump with adjustable volume

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The device has an adjustable volume dosing pump e.g. membrane version adjustable volume dosing pump (4), with an inlet valve (7) through which sanitary product contained in a tank (1) is introduced above a piston (4d). A support (8c) of an outlet valve (8) of the pump is connected to an end of a watertight conduit (8a). Another tank includes a filling unit to fill water in the latter tank from a toilet tank (2). The latter tank includes a discharge device in a lower part. The discharge device is formed of a float (20) mounted on an articulated lever (19), which actuates a discharge valve (17).