Mercury - Water Pump Upper Repair Kit Verado Series Composite & Stainless Steel Construction 8M0078858. Overview. There's a certain comfort that comes from knowing the heart of your cooling system is built to take whatever the water throws at it. Anyone who's run a Mercury Verado offshore knows the feeling - you want every part beneath the cowl to be dependable, quiet, and steady. This water pump upper repair kit brings that kind of confidence back to your engine. It's the kind of part you trust