Check the listing for details. POWERTEC Dust Collection Threaded Quick Coupler Adapter, 4 x 2-1/2" (70171). Color: Black, Condition: New. Listed at 13.99 USD. The 4 x 2-1/2" Threaded Quick Coupler by POWERTEC. The POWERTEC 4-Inch by 2-1/2-Inch Threaded Quick Coupler quickly connects a machine’s 4 -Inch dust collection port to a 2-1/2 -Inch dust collection hose. The 4-Inch I.D end is designed to press onto a 4-Inch diameter tapered port. The opposite 2-1/2-Inch end simply threads into a 2-1/2-Inch dust collection port. No hose clamps are required. 4-Inch Nominal end measures 4-13/64-Inch tapered O.D., 3-31/32-Inch tapered I.D.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.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.