Mercury - Flame Arrestor MerCruiser Engine Safety Aluminum & Monel Mesh 8M0113517. Overview. There's a certain peace of mind that comes from knowing the air moving into your engine is being managed by something you trust. Out on the water, you don't always get calm seas or perfect conditions, but you can count on the critical parts that keep your motor breathing safely. That's why boaters appreciate a dependable flame arrestor - it's the quiet guardian sitting right at the heart of the engine. W