In one embodiment, an arrangement for assembly to a squeeze bottle having a threaded neck with an opening at its outer end upon filling of the bottle is provided. The squeeze bottle has a dispensing nozzle unit adapted to be fixedly inserted into the opening and the nozzle unit includs a lower cylindrical part terminating in a flange at its outer end. A washer, through which the cylindrical part is adapted to extend, is interposed between the flange and the outer end of said neck with a hinged tab formed as part of and extending from the washer. Also included is a cover for the nozzle having internal threads to screw onto the neck. The cover has a recess formed therein, the recess having a vertical wall, such that, when said cover is screwed on the neck, the hinged tab will have a portion abutting the wall and preventing movement, unless the tab is pushed in so that the portion clears the wall.