POWERTEC 70146   Eccentric Reducer, 4-Inch to 2-1/4-Inch Connect 2-1/4-Inch opening accessories to standard 4-Inch hose Off-center opening position of 2-1/4-Inch end Tough, durable ABS plastic material 4-Inch nominal end measures 3-61/64-Inch O.D. and 3-45/64-Inch I.D. 2-1/4-Inch nominal end measures 2-1/4-Inch O.D. and 2-Inch I.D.