9x9 Sand SQ Poly Grate

9" x 9", Sand, Square, Structural Foam Polyolefin Grate, With UV Inhibitors, Open Surface Area Is 39.50 SQIN, Flow Rate Of 51.75 GPM, Use With The 9" x 9" Catch Basin Series, Class B Load Rated Which Is Recommended For Medium Duty Pneumatic Tire Traffic, Autos & Light Trucks At Speeds Less Than 20 MPH.