OMC Lower Unit Seal Kit - 18-2671 OMC Lower Unit Seal Kit - 18-2671 by Sierra. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. $ 33.23               More Information      Quantity:     Lower Unit Seal Kit - 18-2671 Lower Unit Seal Kit - 18-2671. 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 at Check-Outnd adjust as necessary. Send us an email (Contact Us button at top of any page) if you have any questions. $ 33.23               More Information      Quantity: