Quicksilver 19453T Water Pump Impeller - Mercury 3-Cylinder 40 Horsepower 4-Stroke Outboards Provides cooling water to your outboard engine Produced to Meet Mercury marine original equipment Manufacturer specifications to best protect your Mercury 4-stroke outboard Impeller elastomers provide improved flexibility across Broad temperature ranges throughout the boating Season Designed for durability to provide higher flow rates and cooling flow to protect your engine Center insert resists tearing to ensure performance