Disclosed herein is a marine propulsion device including a lower unit comprising a laterally extending anti-cavitation plate extending from the lower unit above a propeller and including a trailing portion, together with a trim tab extending downwardly from the trailing portion of the anti-cavitation plate aft of the propeller, and a deflector located aft of the propeller and extending from the trailing portion of the anti- cavitation plate and rearwardly of the trim tab for pressurizing the water forwardly thereof and below the anti-cavitation plate and in the region of the trim tab during forward movement of the lower unit through the water.
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