Adaptor for connecting a windscreen wiper unit to a driving arm

An adaptor for connecting a windscreen wiper unit to a driving arm, the adaptor comprising:

• two substantially parallel walls connected together by at least one connecting element, the walls having inner side faces between which the at least one connecting element extends, and outer side faces,
• wherein one of the walls comprises a first upper longitudinal edge having a longitudinal end connected to an upper end of a second edge which is substantially perpendicular to the first edge, and a lower end of which is connected to a longitudinal end of a third upper longitudinal edge, the at least one connecting element being connected to the third upper longitudinal edge;
• and
• at least one stop element which is mounted on the one of the walls and which projects at least partially from the outer side face of the one of the walls,
• wherein the at least one element is movable between an operational stop position and a non-operational position,
• wherein the at least one element is connected by a hinge to the one of the walls, and
• wherein the hinge defines a hinging axis of the element, which is substantially parallel to an elongation axis of the adaptor.