Conventional dispensers for a cosmetic fluid, such as a liquid, comprises a bottle having a housing for a low regulator, such as a roller or preferably a ball and a cap which is securable to the bottle by a single set of co-operating screw threads. An improved dispenser secures the cap to the bottle, and especially to the housing, by a plurality of sets of mounting elements, one of which comprises a cam providing axial movement of the cap when it is rotated around the bottle and the other a follower, such a lug and bayonet. One element is mounted on the interior of the cap and the other on the exterior of the bottle/housing. The mounting elements on the bottle/housing advantageously are separated both laterally around the periphery and axially so as to permit the mounting elements on the cap to pass axially between adjacent bottle elements and the cap to be rotated until matched sets of elements are brought into contact. The bottle can comprise separate moldings for the housing and the reservoir which are in fluid tight fitting, the moldings preferably having anti-rotational means such as an axial-extending lug on one molding that can be slid into an axial slot channel or socket on the other molding.