Water Pump Impeller Repair Kit. Including New Style (Yellow) Gearcase Drain & Fill Screw Washers. This Genuine Repair Kit fits. Mercruiser Alpha One Gen 2.The item "Genuine WATER PUMP IMPELLER REPAIR KIT for Mercruiser Alpha One Gen 2 Gearbox" is in sale since Saturday, February 23, 2019. This item is in the category "Vehicle Parts & Accessories\Boats Parts & Accessories\Boats Parts & Maintenance". The seller is "outboards12" and is located in Soham Cambridgeshire, GB. This item can be shipped worldwide.