NDS 970G 6-Inch by 6-Inch Square Grate with 4-Inch Adapter Use to drain excess water and direct it to a more water safe area such as a curb or gutter Can be use in large lawn areas, large landscape areas, patios and atriums Can be used with 3" or 4" sewer and drain pipe and fittings Can be used with 3" and 4" corrugated pipe and 3" or 4" triple wall pipe Designed for maximum durability and drainage