The present invention relates to a device for dispensing a windshield-cleaning liquid for windshield wiper blades of a motor vehicle, comprising: a hydraulic pipe (7, 8) having at least one liquid flow channel (7a, 7b, 8a, 8b); at least one hydraulic coupling (9, 10, 11, 15) for transporting of liquid to said pipe or discharging the liquid from said pipe, characterized in that the dispensing device also comprises at least one non-return valve (20) received in the flow channel (7a, 7b, 8a, 8b) or in a hydraulic coupling (9, 10, 11, 15).
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