Anodes

68 marine anodes covering pencil, propeller, transom, rudder, outdrive and thruster patterns, plus engine-specific kits.
Anodes
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Anodes

Anodes

An anode is the cheapest part on a boat and the one that saves the expensive ones. It corrodes in place of your drive, shaft, rudder and cooler, which means a spent anode is an anode that did its job. Off Grid Superstore stocks 68 marine anodes in Australia.

What's in the range

Pencil Anodes covers the engine-side zincs that screw into heat exchangers and oil coolers, including the CDZ9-092 Detroit Cummins Zinc Engine Pencil Anode. Anode Kits holds 14 complete sets matched to a specific drive, such as the Martyr Aluminium Anode Kit for Mercury, which saves sourcing each piece separately.

Below the waterline, Propeller Anodes and Bow Thruster Anodes cover the spinning gear, with transom, rudder, sterndrive and trim ram patterns listed separately. Bar anodes like the CDZ9-086 Hamilton Jet Zinc Bar Anode suit jet units.

Zinc, aluminium or magnesium?

Match the metal to the water. Zinc is the standard for salt water and is what most Australian boats run. Aluminium works in salt and brackish water and lasts longer than zinc for the same size, which makes it a sensible upgrade on a boat that moves between estuaries and open water. Magnesium is for fresh water only, and putting it in salt water burns it off in weeks.

Whichever you choose, never paint an anode and never mix metals on the same vessel. For the rest of the servicing list, Boat Maintenance covers filters, tapes and cleaning, and Boat Systems covers the drives the anodes protect.

How often should marine anodes be replaced?

Inspect them at least once a season and replace once about half the material has gone. A boat kept in the water works through anodes faster than a trailered boat, and a sudden jump in wastage usually points to stray current rather than normal galvanic loss.

Should I use zinc or aluminium anodes?

Zinc is the traditional choice for salt water. Aluminium also works in salt and brackish water, lasts longer than zinc for the same size and stays active where zinc can passivate, which makes it the better pick for boats that move between estuaries and open ocean. Magnesium is fresh water only.

Why should you never paint an anode?

An anode has to be in direct electrical contact with the water to corrode in place of your running gear. Paint or antifoul insulates it, so it stops working entirely and the drive or shaft starts corroding instead.

What is an anode kit?

A kit gathers every anode for one specific drive or engine into a single part number, matched to the model. It saves cross-referencing individual anodes and means you are not left with the transom piece missing at the end of a service.