DraftTight Old Work Box Creates a Draft-Resistant Seal for Better Energy Efficiency in Remodeled Homes. ® The easiest method for adding an electrical box to an existing home is to use what’s known as an old work electrical box. Conventional old work boxes, however, provide no means for sealing the wall surface opening to prevent airflow from entering the house around the perimeter of the box and through the cable clamp openings. The Carlon® DraftTight® Old Work Box takes care of that problem with ease.
