Gasket, Exhaust Riser Exhaust Elbow Gasket (Fresh Water Cooled System). Replaces: Mercruiser 27-860231 and 8637251. Replaces: Marine Power: 283135Mercury: 27-8637251Sierra: 18-0672Gasket, Exhaust RiserSKU: 283135$13.00PriceQuantity*Add to Cart