POWERTEC 70178 Elbow, 2-1/2" Overall size: 5-Inch x 5-Inch x 2-1/2-Inch Tough, durable ABS plastic material Simple and quick to install; Provides a multitude of applications Provides airtight friction fit Both 2-1/2-inch nominal ends measure 2-31/64 tapered O.D. and 2-7/32 I.D.