18 x 36 Inch SuperFlow PVC Frame and Flat Grate state_Oklahoma Other features include a redox

Other features include a redox sensor

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18 x 36 Inch SuperFlow PVC Frame and Flat Grate state_Oklahoma Other features include a redoxThis is an 18 x 36 inch SuperFlow PVC Frame and Flat Grate. The SuperFlow VGB 2017 certified main drain grates and covers have a super flow rate and a unique top profile design that provides extreme comfort under foot. These large area main drain frames and grates actually begin at 18 inch x 36 inch and go up in size in 18 inch increments. The SuperFlow capacity starts at 2080 GPM; that is unmatched by the competition. Install end to end to