Introducing the 4-Inch Dust Collection Fittings Connector by POWERTEC. This dust collection attachment provides you with a compact, versatile and convenient solution to connecting your 4" OD pipes, Y branches, T branches, elbows, blast gates and more. It comes equipped with dual tapered ends with 4" nominal I.D. openings that work exclusively with (and accept) 4" O.D. ports - and they don't require tape or hose clamps. Possessing a highly durable ABS plastic construction, it delivers optimal friction for a snug and secure fit without impacting the effectiveness of your dust collection fittings. This quick connect disconnect tool is ideal for improved workflow or anyone multitasking between dust collector machines. // Compatibility - Tapered End: 4-Inch nominal inner diameter end presses onto any 4-Inch diameter tapered dust collection port // Please Note: This item is intended for 4" OD dust collection fittings. It is not meant to connect a pair of 4" ID hoses together (SEE POWERTEC 70123) // Dimensions - 4-Inch nominal ends measure tapered 4-1/4-Inch O.D. : 3-31/32-Inch I.D. and 4-1/4-Inch O.D. : 3-15/16-Inch I.D. // Package Contains - (1) Dust Collection Fitting Connector. // From the Manufacturer - The POWERTEC 4-Inch hose coupling allows you to connect 2 flat ended fittings together.