Pentair Winterizing Plug for Aqualuminator Light

This is a special sized expandable plug that is used for the Pentair Aqualuminator Aboveground pool light. It is also for the DarkBuster light. This plug is made to plug the fitting of the Aqualuminator after the bulb is removed for the winter. This plug will eliminate water loos through the wall light fitting during winter shut-down. Remove the bulb from the housing and insert this expansion plug.