Mercathode Kit (Transom Mounted), Mercury - Mercruiser 88334A-2 Transom Mounted system is mounted with the anode and reference electrode on (and through) the transom of the boat on opposite sides of the drive. The black controller is mounted inside the boat. Fits: All boat applications with a 12 volt operating system.; Special Order Mercury Marine Information: Additional Handling Time: Item transfers from an alternate warehouse requires an additional 13 business days to ship.; Non Returnable: This item is ordered specifically for your application and cannot be returned or canceled once processed.; Verify Fitment Before Ordering: Please confirm compatibility with your engine model.;