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Specified Fittings Backing Ring, 6 in Nominal Size, 6.88 in Inside Dia, 11 in Outside Dia, 0.63 in Thickness, 8 Bolt Holes, 9-1/2 in Bolt Hole Size, Flange Connection, 200 psi, 150 lb, SDR 11, Ductile Iron, Epoxy Coated