OMC Plug - 18-4251 OMC Plug - 18-4251 by Sierra. Please use the Red PARTS CHARTS button (top of any page) to locate the correct part for your application. $ 1.98               More Information      Quantity:     Plug - 18-4251 Plug - 18-4251. 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-Out and adjust aseessary. Send us an email (Contact Us button at top of any page) if you have any questions. $ 1.98               More Information      Quantity: