Introducing the Aluminum Blast Gate (2-1/2 in.) by POWERTEC. This attachment helps direct and regulate air flow to your chosen machine, maximizing dust extraction by opening and closing chosen ducts. This dust collector blast gate acts as an in-line gate to control the vacuum flow to certain areas of your work shop. This aluminum blast gate works seamlessly with properly sized plastic and metal ducts, flexible hoses and 2.5 in. ID ports for a wide range of popular brands. Unlike other models that require constant clearing, cleaning and maintenance, this unit has an improved air proof design with closed edges, and easy clearing which allows for clog-free. The gate also has a built-in stop that keeps it exactly where you need it during operation. Premium Construction: The durable cast aluminum body and premium steel sliding gate of these blast gates are designed to withstand the harmful effects of wood chips, saw dust and other debris. They are resistant to common abrasives, which means they stand up to the harmful effects of wood chips, saw dust and other debris, with this in mind. These blast gate components, which are used alongside a capable dust collection system, provide exceptional quality for any professional workshop environment.