✓Exact Cross-Reference Impeller (47-89983T Pattern): Direct aftermarket replacement for Mercury/Mariner/Quicksilver outboard lower-unit pumps. Replaces 47-89983T, 47-89983, 47-89983B, 47-65959, 47-20268 and aftermarket Sierra 18-3007, GLM 89830, Mallory 9-45300, CEF 500312. Match the number stamped on the old impeller hub before ordering
✓Fits Mercury Mariner 30-70 HP 2-Stroke Outboards: Compatible with 30, 35, 40, 45, 50, 60, 65, 70 HP Mercury/Mariner 2-stroke portables and mid-range motors (2/3/4-cylinder GS/GTI/GTS-era and many pre-1996 30-70HP 2S blocks). Covers 51.8 mm OD / 19.2 mm bore / 19.1 mm height / 6-vane pattern
✓Correct Dimensions with 6-Blade Neoprene and Brass Hub: Overall diameter 51.8 mm (2.04 inches), height 19.1 mm (0.75 inches), shaft bore 19.2 mm (0.76 inches), 6 vanes, brass/nylon insert. Flexible marine neoprene resists salt-water swell and vane fracture at trolling RPM
✓Restores Cooling Flow and Prevents Overheat: Worn impellers shed vanes and kill the tell-tale stream. This replacement restores raw-water lift, protects the powerhead from heat scoring, and is recommended every 100 to 200 running hours or 1 to 2 seasons on older 2-strokes
✓Drop-In Lower-Unit Swap: Seat the drive key, rotate impeller clockwise while lowering pump cover to bed vanes, grease housing lightly, torque cover screws to manual spec. Disconnect spark plug lead before service; inspect wear plate and replace if scored
✓Durable Construction Materials: Made from high-quality black neoprene rubber exterior with a golden brass insert, engineered to ensure reliable performance, longevity, and optimal water flow for efficient cooling of your outboard engine