Mercury - Flame Arrestor Inboard & Tow Sport Series Marine-Grade Metal 8M0113519. Overview. Out on the water, peace of mind comes from knowing the heart of your boat is protected. When you throttle up and hear that deep, steady tone from your engine, you want to trust that every component is doing its job quietly and reliably. A flame arrestor might not be the part you think about often, but when it's working right, you feel the difference in confidence and control. The Mercury 8M0113519 Flame A