This part has superseded to the new part number 12155-ZV5-010. Honda BF25A~BF250D Internal Anode Metal - 12155-ZV5-000. Important: Two anodes required per engine.. Protect critical internal cooling passages with the genuine Honda internal anode metal. The 12155-ZV5-000 is a sacrificial anode designed to help reduce corrosion inside the engine where water constantly flows. These anodes are located inside the water passages on both the intake and exhaust side, making them an important maintenance item for long-term reliability in harsh marine conditions.. Key Features. Genuine Honda internal anode metal for corrosion protection. Two required per engine. Located inside water passages on both intake and exhaust sides. Sacrificial design helps protect engine components from corrosion. Ideal for preventative maintenance and routine corrosion control. Fitment. Honda BF25A through BF250D. Why It Matters. Internal anodes are designed to corrode first, helping shield expensive engine components