12 X 12 Green Square Grate

12 inch x 12 inch , Green, Square Grate, Made Of Structural Foam Polyolefin With UV Inhibitors, The Open Surface Area Is 50.76 SQIN With 66.50 GPM, Use With The 12 inch x 12 inch Catch Basin Series, It Is Rated A Class B Load, Which Is Recommended For Medium Duty Pneumatic Tire Traffic, Autos and Light Trucks At Speeds Less Than 20 MPH.