POWERTEC 70186 Threaded Quick Coupler, 5 x 4" 5-Inch I.D. end presses onto any 5-Inch diameter tapered dust collection port The 4-Inch threaded end threads into a 3-Inch dust collection hose Tough, durable ABS plastic material Does not require hose clamps 5-Inch nominal end measures 5-13/64-Inch O.D. and 4-31/32-Inch tapered I.D.