Mercury - Quicksilver Water Pump Impeller Cooling System Component Marine-Grade Rubber 19453T. Overview. Your outboard's cooling system is what keeps it performing smoothly, and the Mercury Marine 19453T Quicksilver Water Pump Impeller is at the heart of that system. Designed for Mercury 3-cylinder 30-60 horsepower FourStroke outboards and select Force 75HP models, this OEM impeller delivers the flow and reliability your engine needs to stay cool under load. Built from high-flexibility marine-gr