a method and apparatus for reinforcing duct work is provided . in one embodiment , a reinforcement comprises a conduit having a first end and a second end . a pair of plugs is insertable into the first and second ends of the conduit . each of the plugs has a groove extending along the circumference of the plug , and the plugs are crimped inside the conduit along the grooves . each of the plugs may have a threaded end extending out of the plug and being retractable into said plug . alternatively , each of the plugs may have an internally threaded opening extending at least partially through the plug . in this embodiment , the conduit can be secured to duct work by aligning the conduit with holes in the duct work , and inserting a bolt through the holes and into the internally threaded openings of the plugs .