Oatey 88033 ABS Roof Drain with ABS Dome and Dam Collar, 3-Inch Designed for use in finished areas with moderate to heavy traffic and where wastewater contains debris PVC drains comply with ASTM D2665 ABS drains comply with ASTM D2661 Drain bases available to fit: Over 2-Inch ABS/PVC pipe, over 3-Inch ABS/PVC pipe, over 4-Inch ABS/PVC pipe, over 6-Inch ABS/PVC pipe. Domes available in black cast or UV-stable ABS