Mercruiser Impeller Repair Kit - 18-3217 Mercruiser Impeller Repair Kit - 18-3217 by Sierra. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. $ 27.35               More Information      Quantity:     Mercury/Mariner Impeller Kit - 18-3217 Mercury/Mariner Impeller Kit - 18-3217. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. All prices are per unit (50' Coil=50 Units, 2 PK=2 Units, and etc.). Verify your quantity is correct atCheck-Out and adst as necessary. Send us an email (Contact Us button at top of any page) if you have any questions. $ 27.35               More Information      Quantity: