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Product Description The JET 4" Aluminum Blast Gate is designed for JET dust collectors (but, its universal fit makes it compatible with most other dust collectors). This blastgate gives you ideal control over air flow between woodworking machines. Constructed with an aluminum body, and steel gate, this accessory is designed for years of use. Finally, this product is covered by JET Tool.. From the Manufacturer You've done the right thing by outfitting your shop with a dust collection system--now make it work even better. Blast gates are used in dust collection systems to control airflow from one machine to another, maximizing system efficiency. These 4-inch OD top-quality blast gates feature a cast-aluminum body with steel gate and locking knob.