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Specified Fittings Backing Ring, 4 in Nominal Size, 3-3/4 in Inside Dia, 7-1/2 in Outside Dia, 0.53 in Thickness, 4 Bolt Holes, 6 in Bolt Hole Size, Flange Connection, 200 psi, 150 lb, SDR 11, Ductile Iron, Epoxy Coated