POWERTEC 70171 Threaded Quick Coupler, 4 x 2-1/2" 4-Inch I.D end presses onto any 4-Inch diameter tapered dust collection port 2-1/2-Inch end threads into a 2-1/2-Inch dust collection hose No hose clamps are required Total length: 5-Inch Threaded 2-1/2-Inch end length: 2-3/4-Inch; 4-Inch end length: 2-1/4-Inch