Assembly for the production of a wiping system (1), comprising a terminal part (4) of a wiper arm (3) designed to move a wiper blade (2), and a connecting interface (5) for conveying a liquid to the wiper blade (2), said assembly further comprising one sliding element (6) having a first position for locking a connecting device of the wiper blade (2) on said terminal part (4), and a second position enabling the terminal part (4) and the connecting device to be separated, said sliding element (6) being further able to hang said connecting interface (5) either on the connecting device in the first position or on the terminal part (4) in the second position.