POWERTEC 70105 4-Inch Elbow Dust Hose Connector Overall size: 8-Inch x 8-Inch x 4-Inch; Provides airtight friction fit Tough, durable ABS plastic material Simple and quick to install Provides a multitude of applications Both 4-Inch nominal ends measure 3-61/64-Inch O.D. and 3-3/4-Inch I.D.