POWERTEC 70125 ABS Pipe Hose Adapter, 4" Designed to make connections from your pipe to multitude of fittings Made of superior, durable ABS plastic with high abrasion resistance levels Narrow end measures 4-Inch O.D. and 3-49/64-Inch I.D. to fit inside 4-Inch PVC pipe Large end measures 4-7/32-Inch O.D. and 3-31/32-Inch I.D. to connect to 4-Inch O.D. fittings