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Specified Fittings Backing Ring, 3 in Nominal, 4-3/4 in ID, 0.55 in Thickness, 8 Bolt Holes, 4-1/2 in Bolt Hole, Flanged Connection, 9 in OD, 200 psi, 150 lb Pressure Class, SDR 11, Ductile Iron, Epoxy Coated