Mercury - Water Pump Impeller Repair Kit Cooling System Component Marine-Grade Rubber & Stainless Steel 19453T2. Overview. A healthy water pump is what keeps your outboard running cool, and the Mercury Marine 19453T2 Water Pump Impeller Repair Kit gives you everything needed to bring it back to peak performance. Designed for Mercury 50-60 horsepower TwoStroke outboards with standard gearcases, this OEM kit includes all the critical components - gaskets, seals, plates, and the high-performance im