4"Sand FLT Atrium Grate

4", Sand, Flat Top, Structural Foam Polyolefin, Atrium Grate, With UV Inhibitors, Open Surface Area Is 17.00 SQIN, Flow Rate Of 22.27 GPM, Fits 4" Sewer & Drain Pipe & Fittings, 4" Corrugated Pipe, & 4 " Triple Wall Pipe.