Speedi-Products 4 in. Dia Galvanized Take Off Start Collar and Gasket with Damper

4 in. Air Tight Take Off is an efficient and time saving Start Collar. This Start Collar Includes a Volume Control Damper for Air Volume Adjustment and features an adhesive gasket that attaches to duct board or metal trunk lines. Therefore there are no added sealants that are required unlike a standard start-collar. You no longer have to stick your hand inside a sharp metal collar ever again. There are no sharp tabs to bend back which take time and can cause serious painful injuries. It is a fast way to connect round branch ducts to trunk lines or to the main HVAC unit. It can be used for remodeling, do it yourself, new residential/commercial HVAC projects.