BUILD: Featuring a non-threaded, ABS plastic construction, this dust collection adapter was designed for durability and made to withstand the wear and tear often associated with woodworking dust extraction. FUNCTION: Makes a quick and easy connection from your pipe to a multitude of 4Inch dust collector fittings - Takes all of the work out of connecting, disconnecting or switching from one machine to another. VERSATILE: This pipe to hose adapter is ideal for any professional woodworker or dust control system that utilizes y-shaped, t-shaped, elbows, blast and other fittings. SPECS: Narrow end measures 4-Inch O.D. and 3-49/64-Inch I.D. to fit inside 4-Inch I.D. dust collection hose. Large end measures 4-7/32-Inch O.D. and 3-31/32-Inch I.D. to fit over a 4-Inch O.D. ports or fittings.