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This Johnson F5B-9 flange mounted engine cooling pump replaces Johnson F4B-9 flexible impeller pumps (10-24086-1) and features two vertical 3/4" threaded ports. Raw water engine pump is suitable for MWM marine engines: D208-2, D208-3, D208-4, D208-6, D225-4, D225-5, D226-2, D226-3,