Complete anode kit to replace all factory installed anodes found on the transom and gearcase. For use in saltwater or freshwater. This is a complete anode kit to replace all factory installed anodes found on the transom and gearcase. Fits Mercury/Mariner: 135/200HP 4 cylinder Verado 75/115 (1.5L) 135/250HP (2.5L and 3.0L) Optimax Engines. *Fasteners are not included.