Mercury - Strainer Assembly Kit V6 & V8 FourStroke / Racing Series Marine Polymer & Seal 8M0142719. Overview. If you spend enough time offshore or running long stretches of river, you learn to respect every component that keeps your engine cool and steady. A clean, reliable cooling system is the difference between a perfect day on the water and a long, stressful limp back to the dock. The Mercury 8M0142719 Strainer Assembly Kit plays a quiet but crucial role in that peace of mind. It catches deb