POWERTEC 70181 Union Hose and Splice, 2-1/4" Allows easy connection and disconnection of two 2-1/4-Inch O.D. adapters or fittings It can splice or couple two 2-1/2-Inch flexible dust hoses together Quick and easy to use Tough, durable ABS plastic material Both 2-1/4-Inch 2-1/2-Inch nominal ends measure 2-29/64-Inch O.D. and 2-19/64-Inch I.D.