Mercury - Quicksilver 817275K05 Upper Water Pump Repair Kit MerCruiser Alpha One Gen II Sterndrives 817275K05. Overview. Your cooling system takes a beating from sand, silt, and debris - and when flow starts to drop, your engine feels it. The Mercury 817275K05 Upper Water Pump Repair Kit restores strong, reliable water flow in your MerCruiser Alpha One Gen II sterndrive. This OEM kit includes everything you need to rebuild the upper pump assembly and protect your engine from overheating or impel