Speedi-Collar is the modern prompt and time saving Start Collar alternative you 've been waiting for. This revolutionary start-collar an pasty gasket that attaches to passage board or metal trunk lines. The proprietary Quick-Zips to create a virtually air snug seal. Therefore there no else sealants that are required unlike a criterional start-collar. The proprietary Quick-Zip reduces installation time from 10 mins plus down to a unit of time or less. And if you pre-attach the bend passage, you can be out of the or crawl space in minutes, not hours. The collar was with the Quick-Zips set on the exterior of the collar flange. You wo n't to stick your hand inner a acute metal collar ever again. There no acute tabs to bend endorse which take time and can cause sensible sore injuries. It is the fastest to connect passage to trunk lines or to the independent HVAC unit. It is the `` One that Fits All ''. It can be with 1-Inch, 1.5-Inch and 2-Inch passage board and zips snug or attach to sheet metal trunk lines with screws through the pre-drilled holes on the collar flange. You would at least four distinct metal tab collars and have dozens of injury causing tabs to bend endorse to do the like thing. It can be used for Remodeling, it yourself, New Residential/Commercial HVAC projects. This Speedi-Collar with a preassembled damper that ratchets in place.