Oatey 84147 ABS General Purpose Cleanout with 6-Inch BR Cover and Square Ring, 3-Inch or 4-Inch Designed for use in finished areas where moderate to heavy traffic is expected PVC cleanouts designed to comply with ASTM D2665 ABS cleanouts designed to comply with ASTM D2661 Cleanouts offered in three base sizes: 4-Inch Hub Cleanout Base, 4-Inch Pipe Cleanout Base, 3-Inch or 4-Inch Pipe Cleanout Base (fits over 3-Inch pipe and inside 4-Inch pipe) Barrel threads are 3-1/2-Inch IPS