Shop All Marine Anodes

Start with what the anode protects, sterndrive, saildrive, outboard, shaft, hull fitting, propeller, or engine cooling system. Then confirm the make and model, plus year or serial where possible. Match the anode’s shape and dimensions, including hole spacing, thickness, and fixing type. If you can find a part number on the old anode or your parts diagram, use that to confirm. Photos of the anode position and the old anode are often the quickest way to verify.

Choose based on your typical water type. Zinc is commonly used in salt water, aluminium is widely used in salt and brackish environments, and magnesium is generally used in fresh water. If your boat moves between waters, pick based on where it spends the majority of the season. Do not guess if you are unsure, because the wrong material can waste too quickly or not perform as expected. If you tell us where you boat and what the anodes fit, it is easier to guide the choice.

Fast wastage can happen if the anode material is not suited to your water, if the boat has stray current issues, or if bonding and connections are poor. Check that the anode has clean metal-to-metal contact and is not painted over. Inspect bonding straps and wiring for corrosion, and consider whether shore power, battery chargers, or nearby boats could be contributing. Also confirm you have all the anodes fitted that your setup requires, because missing anodes can force the remaining ones to work harder.