Mercury Water Pump Repair Kit | Sierra 18-3322 Sierra 18-3322 Mercury Water Pump Repair Kit Sierra 18-3322 Mercury Water Pump Repair Kit Contains impeller, upper pump housing, water pump base,drain gasket, lower water pump base to face plate gasket, upper face plate to body gasket plate to body, 2 water pump base gaskets, drain plug, plate, 3 o-rings Replaces Mercury 46-77516A3 Replaces Mallory 9-48303