Mercury - Quicksilver Water Pump Repair Kit Cooling System Component 4-4.5HP 2-Stroke Outboards 70941A3. Overview. A strong water pump keeps your outboard running cool and dependable. The Mercury Marine 70941A3 Quicksilver Water Pump Repair Kit is built for Mercury and Mariner 4-4.5HP single-cylinder 2-stroke outboards, giving you everything you need to restore proper cooling flow. This all-in-one kit includes the impeller, upper and lower housings, gaskets, seals, water tube, drive key, and fac