NDS 970 9-Inch Square Grate, Black Use to drain excess water and direct it to a more water safe area such as a curb or gutter Will accommodate 86.88 GPM with 1/2" of head Can be use in large lawn areas, large landscape areas, patios and atriums Can also be used with 6" sewer and drain pipe and fittings and 6" corrugated pipe Open surface area 28.4 sq. in