Introducing the Screw End Quick Coupler by POWERTEC. This hose connector was designed to provide you with a quick and easy connection between a 2-1/4-inch ID dust port/fitting and 2-1/2-inch ID left-hand flexible hose. This must-have component not only expands the versatility and efficiency of your shop vac or dust collection system, but does so instantly and with measurable results. Easy-To-Use Threaded Design The threaded 2-1/2-inch end of the coupler screws firmly into your flexible hose, thus ensuring an airtight friction fit. This eliminates the need for a hose clamp, or the hassle of constantly connecting and disconnecting each time a different woodworking machine is utilized. Easy-To-Use Tapered Design The nominal 2-1/4-inch OD end is slightly tapered, providing a snug press-on fit to your 2-1/4-Inch ID port, and allows you to quick change from port to port. Depending on your project, this provides you with a choice of adaptive accessories for your dust collection system. Additional Product Specifications. Color: Black. Material: ABS Plastic POWERTEC is a leading manufacturer of high quality woodworking tools and accessories, machines, and an assortment of OEM replacement parts. We are committed to exceeding expectations, while bringing the latest innovations, technology, and product development to the industry.