Mercury - Quicksilver 8M2004414 Exhaust Elbow Gasket Standard Cooling Series Marine Composite 8M2004414. Overview. Anyone who's spent enough weekends on the water knows that a dependable engine isn't just about horsepower-it's about the small, unseen parts quietly doing their job trip after trip. The Quicksilver 8M2004414 Exhaust Elbow Gasket is one of those parts. It sits tucked away in your V6 or V8 MerCruiser, creating a tight seal that keeps water and exhaust exactly where they're supposed t