Reduces noise up to 55% when flushing outboards. Insert into aft side of prop. Creates a back pressure enabling accurate adjustment to engine idle, etc. Alloy body, with a special rubber 'O' ring seal. Suits standard props. Suits 60-115HP Johnson/Evinrude, 85-115HP Mercury/Mariner, 75-140HP Suzuki, and 60-140HP Yamaha.
SKU 8221431

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