A retaining apparatus configured to couple to a valve stem of an aerosol container and to interface with a dispenser to actuate the valve stem. The apparatus includes a body portion having an internal bore configured to receive a valve stem. The internal bore has an internal diameter. A wall has a thickness defined between the internal bore and an exterior surface of the body portion. The body portion further includes an aperture having a diameter selected to avoid atomization of fluid travelling through the aperture. The wall thickness is selected to prevent collapsing of the wall when the valve stem is actuated.
