Mercury - Quicksilver Sea Water Pump Impeller Kit Cooling System Component Bravo I, II & III 59362A4. Overview. A healthy impeller means a healthy cooling system, and the Mercury Marine 59362A4 Quicksilver Sea Water Pump Impeller Kit delivers everything you need to restore proper water flow in your MerCruiser Bravo I, II, and III drives with the two-piece plastic pump body. This 5-piece OEM kit includes the impeller, face plates, and o-ring - all built to Mercury's original specifications. Made