Oatey 78024 PVC Roof Drain with Cast Iron Dome, 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) Domes available in black cast or UV-stable ABS