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4", green, flat top structural foam polyolefin atrium grate with uv inhibitors, open surface area is 14.50 sqin, & it's 19.00 gpm, fits 4" sewer & drain pipe & fittings, 4" corrugated pipe, & 4 " triple wall pipe.
WARNING: This product can expose you to chemicals, including Vinyl Chloride which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov