Mercury - Quicksilver Water Pump Impeller Repair Kit Cooling System Component Complete OEM Kit 42038Q3. Overview. A reliable cooling system is vital to your outboard's performance, and the Mercury Marine 42038Q3 Quicksilver Water Pump Impeller Repair Kit gives you everything needed to keep it running cool and efficient. Designed for Mercury and Mariner 6-15HP TwoStroke and FourStroke outboards, this all-in-one OEM kit includes the impeller, gaskets, face plate, drive key, and water tube guide -