4 in. Blast Gate with Dust Control Flex Cuff for Dust Collector/Vacuum Fittings The POWERTEC Dust Control Flex Cuff with Hose Clamps, 4 in., delivers an airtight connection from one dust-collection fitting to another of comparable size, while eliminating the need for flimsy duct tape connections or other permanent fasteners. Firm yet pliable rubber construction allows enough flexibility to bridge slight diameter differences in hose or tubing. Pre-molded indents on the cuff allows for easy, airtight clamp installation. Handy set includes one rubber cuff and 2 steel hose clamps. This POWERTEC 4 in. Blast Gate helps maximize your dust collection system by regulating proper air flow to your designated machine of choice. Acting as an in-line gate to control the vacuum flow to specified areas of your work shop, it's designed to work seamlessly with a variety of flexible hoses, ducts and 4 in. ports for an assortment of popular brands. Compatibility- Both ends have 4 in. OD outlet diameters and are designed to work with 4 in. ID dust hoses or other 4 in. ID ports. Will not connect directly to other 4 in. OD ports, please confirm that the actual listed size fits your application before ordering. If connecting to a 4 in. OD port. Universal Fit- Featuring a nominal 4 in. OD diameter, this unit will provide a perfect fit for most professional and at-home workshop dust collection systems. Whether you're a beginner or seasoned woodworker, it's easy to use and install.