This female clip-onconnector (1), which is adapted to cooperate with a male attachment end fitting (20) of the type with a central bush (26) and a flange (25), includes a body (2) forming a cylindrical cavity and a transverse latch housing in front of the opening of the cylindrical cavity forming a housing for a single latch part (50) including two actuating parts (51) connected respectively to two jaws (52), said actuating parts and said jaws acting in a same direction transverse to the axis of the body, and spring means (54) for spring-loading each jaw (52) at all times towards its rest position in which the jaw (52) is close to the axis and in which the actuating part (51) is in its radially outermost position.