Mercury - Exhaust Elbow Gasket (Restrictor) Cooling & Exhaust System Marine Composite 863724. OverviewIf you've spent any time running an older MerCruiser V6 or V8, you know how much trust you place in the small parts hidden deep in the engine compartment. An exhaust elbow gasket might not look like much, but when the water's rough and the engine is working hard, you want the peace of mind that comes from knowing every seal is doing its job. This Mercury Marine part brings back that confidence w