An oversized actuator and actuator assembly for a plastic vessel (or container) configured to hold a product under pressure, such as, for example, a lotion, cream, spray, ointment, gel or foam. The oversized actuator and actuator assembly are configured to be attached to what is considered to be a common, standard-sized valve cup (typically about 1.0 to 1.5 inches across) fastened to a common or standard-sized neck portion for a plastic vessel. Therefore, the actuator and actuator assembly of the present invention does not require that the shoulder of the plastic vessel to which they are attached have specialized geometry molded into the shoulder or body portions of the plastic vessel in order to hold the actuator or actuator assembly in place on the plastic vessel.