An assembly for securing and sealing a dispenser to a container having a flange surrounding an opening therein is provided. The assembly includes a dispenser sub-assembly having an outer body with an outer surface adapted to engage an inner surface of the opening so as to secure and seal the dispenser sub-assembly within the opening. A retaining collet having a downwardly extending skirt having a bottom portion extending radially outwardly is positioned to surround the flange. A decorative collar having a sleeve about its periphery is slideable through a path of movement over the retaining collet to an assembled position. The sleeve of the decorative collar deforms the bottom portion of the skirt of the retaining collet radially inwardly to a position under the flange of the container as the decorative collar is slid to the assembled position so as to maintain the decorative collar in the assembled position.