Mercury - Water Pump Repair Kit 25-30hp 4-Stroke Series Composite & Stainless Components 8M0208905. Overview. If you've spent enough time running shallow creeks, easing through backwater channels, or pushing long days on open bays, you know how important a healthy cooling system is. When the water pump starts to fade, you feel it-not always in sound, but in that uneasy sense that something isn't flowing the way it should. The Quicksilver 8M0208905 Water Pump Repair Kit brings back that peace of