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Smith-Cooper® Companion Flange, Series: 18TH1, 4 in Nominal, 0.94 in Thickness, 7-1/2 in Diameter Bolt Circle, 8 Bolt Holes, 3/4 in Bolt Hole, Thread Connection, 9 in OD, 125 lb Pressure Class, 1.31 in Length Through Hub, Cast Iron, Galvanized