Mercury Water Pump Repair Kit | Sierra 18-3324 Sierra 18-3324 Mercury Water Pump Repair Kit Sierra 18-3324 Mercury Water Pump Repair Kit Includes impeller, upper pump housing, water pump base, 2 drain gaskets, lower water pump base to face plate gasket, upper face plate to body gasket, 2 water pump base gaskets, drain plug, plate, and 3 o-rings Replaces Mercury 46-77177A3 Replaces Mallory 9-48312