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Introducing the GreenSeam+ Collar W/Damper - the perfect addition to your HVAC and refrigeration systems! This versatile fitting is designed to provide a tight seal for ducts up to 10-inch diameter, made of durable galvanized steel. The collar includes a damper, allowing you to control airflow in your system with ease. Use it with GreenSeam+ snap pipe (sold separately) for a leak-proof connection that reduces energy costs and increases overall system efficiency. Whether you're working on commercial or residential applications, the Collar W/Damper is an essential tool to have in your arsenal. Improve indoor air quality and save on energy bills with this innovative product from GreenSeam+ - where quality meets sustainability.