Abstract: A clip device for locating an object such as a diffuser in an aperture in a panel comprises a mounting member, a pivotal member, a spring for retaining the pivotal member in either of a first position and second position, and an actuating device comprising a rod and lug whereby the pivotal member can be moved form the first position to the second position. The rod is moveable between an operative condition wherein an end protrudes so as to contact the ceiling panel during insertion of the diffuser in the aperture, and an inoperative condition wherein the end is retracted. The clip can thus be selectively set so as not to operate when the diffuser is installed in the aperture.