NDS® Flat Grate, 3.85 sq-in Screen Area, 11.78 gpm Flow Rate, For Use With: 4 in Corrugated Pipes and 4 in Triple Wall Pipes, 4 in Sewers, Drain Pipe, Fittings, Polypropylene, Green, 4.63 in L x 4.63 in W x 1.5 in H, Additional Information: Round Shape