Mercury - Quicksilver Water Pump Assembly Cover Cooling System Component Composite with Seal Kit 42089A2. Overview. A good seal keeps your engine cool and your boat running smoothly. The Mercury Marine 42089A2 Quicksilver Water Pump Assembly Cover protects the heart of your cooling system on Mercury, Mariner, and Force 6-15HP outboards. It's built to factory specs to restore proper water pressure and protect the impeller from wear. The kit includes the cover, insert, and seal, giving you everyth