This is the heavy-duty sea water pump impeller repair kit for Mercury manufactured 4.5L Mercuries engines (serial number 2A531162 and below) and 6.2L Mercuries engines (stern drive with serial number 2A531196 and below, inboard engines with serial number 2A530773 and below and the Tow Sport inboard engines with serial number 2A531347 and below). See your owner’s manual for replacement schedule. See your engine service manual for instructions. Mercury Marine’s passion for performance is matched by your drive for the new, the unknown. Our legendary reliability and durability let you boldly embrace your next adventure—large or small—knowing you’re backed by the best quality design, engineering, and materials.