Hydraulic connector for a windshield wiper blade having guidance by lateral protuberances

A connection device of a wiper system, comprising:

• a terminal piece positioned at the end of an arm designed to move a blade over the surface to be wiped;
• a blade;
• a mechanical connector attached to said blade for attachment of the blade to the arm by an adapter, said adapter being inserted between the arm and the mechanical connector to allow a rotation of the mechanical connector relative to the arm between a position of use and a position of service, wherein the blade is attached to the arm in a longitudinal movement relative to said arm;
• and
• a hydraulic connector, comprising at least one pipe operatively connected to the mechanical connector for carrying a liquid to the blade through the mechanical connector, and at least one protuberance capable of resting on an element of the terminal piece in order to align the hydraulic connector on the mechanical connector during said longitudinal movement.