Mercury - Quicksilver Water Pump Base Gasket Cooling System Component Marine-Grade Composite 192043. Overview. A healthy water pump system starts with a perfect seal. The Mercury Marine 192043 Quicksilver Water Pump Base Gasket provides that seal, keeping your outboard's cooling system tight and efficient. Designed for Mercury 6-15 horsepower TwoStroke outboards and 9.9-15 horsepower FourStroke carbureted engines, this gasket is built to handle heat, water pressure, and vibration season after se