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Feature

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.