SEI MARINE PRODUCTS- Mercury Force Impeller Kit 47-85089T4 9.9 13.5 15 18 20 25 HP 2 Stroke 4 Stroke This impeller kit replaces OE#: 47-85089T4 and fits 18-25hp 2 Stroke 1984-2005 and 9.9, 13.5-15hp 4 Stroke Mercury, Mariner, and Force outboard lower units.