Mercury Water Pump Repair Kit | Sierra 18-3314 Sierra 18-3314 Mercury Water Pump Kit with Housing Sierra 18-3314 Mercury Water Pump Kit with Housing Contains water tube guide, impeller, housing, base, water pump gasket, grommet, 2 drain gaskets, water pump base to gear housing gasket, 2 water pump gaskets, seal ring, plate, 6 o-rings, and gasket Replaces Mallory 9-48309