Wiper device and method for assembling the wiper device

A wiper device comprising at least one wind deflector unit (12a-12c) and at least one channel unit (18a-18c) integrated into the at least one wind deflector unit (12a-12c), and also comprising at least one wiper blade adapter (20a-20c) which includes at least one adapter attachment (24a-24c) and at least one adapter base body (22a-22c) and is configured to be coupled to at least one wiper arm (110a-110c), characterized by a fluid supply unit (38a-38c) which is configured to supply wiper fluid to the channel unit (18a-18c) and comprises at least one coupling end piece (40a-40c) for latching connection to the at least one adapter attachment (24a-24c), wherein the at least one coupling end piece (40a-40c) includes a housing and a check valve (64a-64c) disposed within the housing, wherein the at least one wiper blade adapter (20a-20c) includes an elongate coupling extension (36a-36c) that extends along a longitudinal axis (58a) away from the at least one adapter base body (22a-22c), wherein the elongate coupling extension (36a-36c) includes a distal tip having a first latching element (52a) and a second latching element (52a′), wherein the first latching element (52a) is spaced from the second latching element (52a′) along a direction perpendicular to the longitudinal axis (58a) by a gap, wherein the elongate coupling extension (36a-36c) further includes a circumferential groove positioned proximal to the first latching element (52) and the second latching element (52a′), wherein the housing of the at least one coupling end piece (40a-40c) includes an elongate opening (50a) extending within an interior of the housing, wherein the at least one coupling piece (40a-40c) further includes a radially inwardly-extending protrusion.