Single Gang drafttight Old Work Electrical Outlet Box, with 18 cu. In. Of wiring capacity. For use with non-metallic sheathed cable. Drafttight(TM) boxes are designed to meet the energy efficiency requirements of modern homes. They feature flexible drywall flange and additional gaskets over the cable entry points to provide vapor tight seal preventing flow of air from entering the house, which leads to greater energy efficiency in the building. Additional features include built-in old work swing clamps that mount directly to the wall for easy mounting in existing construction application. Also features flashed over GFCI cover Screw holes.