Introducing the Screw End Quick Coupler by POWERTEC. This hose connector was designed to provide you with a quick and easy connection between a 4-inch OD dust port/fitting and 4-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 4-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 4-inch (3-3/4-inch OD) end is slightly tapered】, providing a snug press-on fit to your 4-Inch OD 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.