Connection between a wiper blade and a wiper arm of a windshield wiper system for vehicles, with a wiper blade provided on the wiper blade for releasably securing the wiper blade on the wiper arm, wherein the wiper blade as a flat wiper blade substantially, consisting of profiled rail wiper blade body, at least one spring rail and at least one wiper lip forming at least one wiper blade longitudinal side at least one injection or distribution channel with nozzle openings for discharging a cleaning or washing liquid on a vehicle window and with at least one liquid connection to the wiper blade adapter for releasably connecting the at least one injection or distribution channel with at least one at least a partial length provided on the wiper arm outer liquid line for supplying the washing or cleaning liquid to the at least one injection or distribution channel, u Although via a connected to the at least one liquid line coupling unit.
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