SEI MARINE PRODUCTS- Mercury Mariner Water Pump Base 46-821307A2 25 30 35 40 45 50HP 2Stroke 4Stroke This water pump base assembly replaces OE#: 46-821307A2 and fits 25-50 HP 2 stroke and 4 stroke Mercury, Mariner, and Force outboard lower units from 1997-2006.