Mercury - Aluminum Anti-Ventilation Plate Anode Kit Corrosion Protection Aluminum 8M0137814. Overview. Every boater knows that the quiet villains of the water aren't waves or wind-they're the unseen electrochemical forces constantly working against your engine's metal parts. When you run a high-horsepower Mercury FourStroke or Verado, you want the confidence that your gear case and anti-ventilation plate are protected no matter where you launch. That's where the Mercury 8M0137814 Aluminum Anti-V