Engine, sterndrive, and outboard anodes are designed to protect submerged metal components from galvanic corrosion through sacrificial cathodic protection. They are used on marine engines, sterndrives, outboard lower units, propellers, trim tabs, and related underwater hardware where exposed metals require protection in saltwater, brackish water, or freshwater. Anodes are available individually or as complete kits, with different shapes, mounting configurations, and materials selected to match the specific engine or drive system.
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1-2 weeks delivery time The Allpa Magnesium Anode Plate for Mercruiser Alpha One Gen II engines matches OEM 821629, making it an ideal replacement for maintaining corrosion resistance.
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$ 47.50
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1-2 weeks delivery time This Allpa Magnesium Anode Button is compatible with Mercruiser Alpha One and Bravo 1/2/3 models, using magnesium to offer long-lasting corrosion protection, referenced as OEM 55989.
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$ 12.60
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1-2 weeks delivery time Fitting Bravo Gen II models, this lift-ram horseshoe magnesium anode from Allpa corresponds to OEM 806190 and ensures consistent corrosion protection for marine use.
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$ 28.92
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1-2 weeks delivery time The Allpa Magnesium Anode Plate is suitable for Bravo Gen II stern drives, offering strong corrosion resistance and replacing OEM part 821630.
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$ 40.58
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1-2 weeks delivery time Designed for Mercury Mercruiser Bravo 2 models, the Allpa Magnesium Barrier Carrier Anode delivers solid corrosion resistance and is compatible with OEM 806188.
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$ 37.95
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1-2 weeks delivery time This Allpa Magnesium Anode is intended for Bravo 2 drives, referencing 43994 and matching OEM 821631 to ensure effective corrosion defense.
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$ 65.49
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1-2 weeks delivery time The Allpa Magnesium Cutdown Skeg Anode suits Mercruiser drives and protects against corrosion, matching OEM part 46399 for precise compatibility.
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$ 35.54
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1-2 weeks delivery time Made for the stainless steel prop nut assembly of Mercruiser Alpha 1 and Bravo 1 models, this Allpa Magnesium Anode offers vital protection against marine corrosion.
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$ 120.45
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1-2 weeks delivery time This Allpa Magnesium Anode is designed for Bravo 2 prop nut assemblies from 2003 onward, ensuring corrosion protection tailored to Mercury Mercruiser engines.
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$ 139.75
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1-2 weeks delivery time Designed for Bravo 3 models from 2003 and earlier, this Allpa Magnesium Anode fits the prop nut assembly and safeguards marine outboards from corrosion.
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$ 210
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1-2 weeks delivery time Intended for Bravo 3 prop nuts from 2004 to the present, this magnesium anode provides robust corrosion resistance to extend the lifespan of your marine equipment.
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$ 37.86
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1-2 weeks delivery time The Allpa Circular Plate Magnesium Anode, matching OEM 76214-5, is compatible with Mercury Mercruiser outboards and offers reliable corrosion protection in marine environments.
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$ 19.46
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1-2 weeks delivery time The Allpa Magnesium Anode for Mercruiser/Sterndrive/Mercury Outboards is a standard skeg replacement designed to protect engines from galvanic corrosion. It is made of magnesium and matches OEM part number 31640.
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$ 44.50
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1-2 weeks delivery time The Allpa Magnesium Anode with OEM reference 818298 is an outboard bar type that fits Mercury, Mariner, and Force outboards. It helps prevent corrosion and extends engine life.
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$ 44.43
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1-2 weeks delivery time This Allpa Magnesium Anode is designed for Honda outboards and offers strong corrosion protection. It replaces OEM part number 41107ZV500.
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$ 42.50
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1-2 weeks delivery time Specifically built for Honda outboards, this Allpa Magnesium Anode matches OEM reference 41107ZW1B03 and ensures effective protection against corrosion.
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$ 89.31
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1-2 weeks delivery time The Allpa Magnesium Anode for Mercury and Mercruiser Wedge Gen 2 outboards is made from magnesium and provides durable corrosion resistance. It corresponds to OEM part number 826134.
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$ 37.17
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1-2 weeks delivery time This Allpa Magnesium Anode is designed for Nissan and Tohatsu outboards (70–140HP) to protect the transom bar from corrosion. The listed OEM reference is 3C760-2181, but the part shows a Suzuki reference number 5532194900, which may require clarification.
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$ 56.93
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1-2 weeks delivery time The Allpa Magnesium Anode Block with OEM number 397768 is suitable for OMC, Johnson, and Evinrude marine engines. It provides reliable corrosion protection.
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$ 30.06
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1-2 weeks delivery time Crafted for OMC, Johnson, and Evinrude engines, this Allpa Magnesium Anode Block replaces OEM part 398331 and helps guard against corrosion.
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$ 35.83
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What do engine, sterndrive, and outboard anodes protect?
Engine, sterndrive, and outboard anodes provide sacrificial cathodic protection for submerged or water-exposed metal components. Depending on the installation, anodes may protect lower units, gear housings, trim tabs, transom brackets, propeller areas, cooling passages, and other metal parts that are exposed to galvanic corrosion.
The anode is designed to corrode preferentially, helping protect more valuable engine and drive components from deterioration.
Why is regular replacement of engine and drive anodes important?
Sacrificial anodes are gradually consumed while protecting the surrounding metal components, so they must be inspected and replaced before too much material is lost. A heavily worn or missing anode can no longer provide effective protection, increasing the risk of corrosion on the engine, sterndrive, or outboard assembly.
Inspection frequency depends on operating conditions, water type, vessel usage, and the electrical environment around the boat.
How can I choose the correct anode for an engine, sterndrive, or outboard motor?
The correct anode should match the engine or drive manufacturer, model, installation position, dimensions, mounting arrangement, and required anode material. OEM part numbers or cross-reference numbers are often the most reliable way to identify the correct replacement.
Because similar engines and sterndrives may use different anodes depending on model year or configuration, compatibility should always be checked before installation.