This part has been superseded by the new part number 12155-ZV4-A01.. Honda Internal Anode Metal - 12155-ZV4-000. Help protect your Honda outboard from internal corrosion with the genuine Honda internal anode metal, part number 12155-ZV4-000. This sacrificial anode is designed to corrode first, helping reduce galvanic corrosion inside the engine and protecting more expensive internal surfaces and water passages in harsh marine conditions.. Superseded Part Number. 12155-ZV4-000 has been superseded by 12155-ZV4-A01.. If you ordered or referenced 12155-ZV4-000, the updated part number 12155-ZV4-A01 is the correct replacement and is used for fulfillment.. Key Features. Genuine Honda internal anode metal for corrosion protection. Sacrificial design helps protect internal engine components and water passages. Helps reduce galvanic corrosion in saltwater and brackish conditions. Ideal for preventative maintenance and routine corrosion control. OEM fit and function for compatible Honda applicat