Impeller Kit | Sierra 18-32888 Sierra Impeller Kit | 18-32888 Water Pump Base Repair Kit - Mercruiser Replacement| Sierra 18-32888 Sierra aftermarket Mercruiser brass sea water pump base repair kit. Used with Mercruiser pump 46-862914A13.Sierra aftermarket Mercruiser brass sea water pump base repair kit Used with Mercruiser pump 46-862914A13 Includes the impeller, o-ring, base gasket, and stainless steel wear plate Can replace kits used with Mercruiser 350 MAG MPI, 377 MAG MPI, 4.3L MPI, 496 MAG, 5.0L MPI, 5.7L MPI, 6.2L MPI, and 8.1L MAG Replaces Quicksilver 8M0137221