Bell & Gossett O-Ring, For Use With: Model SDG-3 Grooved Pump Suction Diffuser, Model ED-3X, ED-3Z 4 x 3 in Flanged Pump Suction Diffuser Plus, Model FE-3X, FE-3Z 5 x 4 in Flanged Pump Suction Diffuser Plus and Model GE-3X, GE-3Z 6 x 4 in Flanged Pump Suction Diffuser Plus