POWERTEC 70145 4-Inch to 3-Inch Reducer

Connect 3-Inch opening duct to 4-Inch flexible hose Transition 3-Inch duct to 4-Inch standard hose Tough, durable ABS plastic material 4-Inch nominal end measures 3-15/16-Inch O.D. and 3-45/56-Inch I.D. 3-Inch nominal end measures 2-63/64-Inch O.D. and 2-23/32-Inch I.D.