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The propeller may be slipping if you don't have one. You'll need to outfit your boat with the best equipment to guarantee that nothing disrupts your terrific recreational time, whether you're practicing your casting, snorkeling the astonishing marine life, or just drifting on the open sea for pleasure. It only aids in preventing cavitation and, in the worst-case scenario, complete blow-out of a thru-hub exhaust system by keeping the exhaust gases in the slipstream (the water flow between the bottom unit and the propeller hub) from causing cavitation (total loss of propeller "grip"). The diffuser ring prevents exhaust gases from re-entering the blades at low speeds by preventing them from entering the blade.
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