Anode kits are essential for protecting outboard engines, sterndrives, and other submerged boat components from galvanic corrosion.
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1-2 weeks delivery time The Osculati 43.435.00 – Mercruiser 821631A-1 Zinc Anode is a direct OEM replacement designed to protect Mercruiser sterndrives from galvanic corrosion in saltwater conditions. Cast from high-grade zinc for consistent and effective sacrificial performance, this anode fits various Alpha and Bravo sterndrive models. It offers reliable underwater protection for metal components, ensuring longevity and structural integrity of the drive unit. Compatible with OEM reference 821631A-1.
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$ 58.17
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1-2 weeks delivery time The Osculati 43.435.01 – Mercruiser 821631A-1 Aluminium Anode is a lightweight and efficient sacrificial anode designed for Mercruiser Alpha and Bravo sterndrives operating in saltwater or brackish environments. Made from a high-performance aluminium-zinc-indium alloy, this anode offers excellent galvanic protection with longer service life and reduced environmental impact compared to zinc. Fully compatible with OEM reference 821631A-1, it installs directly using factory mounting points.
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$ 41.45
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1-2 weeks delivery time The Osculati 43.435.02 – Mercruiser 821631A-1 Magnesium Anode is a high-activity sacrificial anode specifically designed for Mercruiser Alpha and Bravo sterndrives operating in freshwater. Manufactured from high-purity magnesium, it offers maximum electrochemical reactivity to effectively protect submerged metal components from galvanic corrosion in low-conductivity environments. This anode is a direct-fit replacement for OEM part 821631A-1 and features precise factory-aligned mounting dimensions.
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$ 61.43
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1-2 weeks delivery time The Osculati 43.259.03 is a zinc anode designed for Mercury outboard engines from 2 to 6 HP, fully interchangeable with OEM part 810945M. It protects the engine's lower unit and submerged components from galvanic corrosion. Ideal for saltwater applications, this compact anode ensures long-lasting protection for lightweight motors.
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$ 20.03
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1-2 weeks delivery time The Osculati 43.424.00 – Mercruiser 806190A Zinc Leg Anode is a robust sacrificial anode designed for Mercruiser Bravo and Blackhawk sterndrives operating in saltwater conditions. Cast from marine-grade zinc for effective galvanic protection, this anode mounts securely to the sterndrive leg, directly replacing the original Mercruiser part 806190A. With its precise OEM fit and durable composition, it helps extend the lifespan of underwater metal components by neutralizing electrolysis.
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$ 28.85
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1-2 weeks delivery time The Osculati 43.424.30 – Mercruiser 806190A Aluminium Leg Anode is a high-performance sacrificial anode designed for Mercruiser Bravo and Blackhawk sterndrives operating in saltwater or brackish conditions. Manufactured from a premium aluminium-zinc-indium alloy, it offers excellent corrosion protection with reduced weight and lower environmental impact compared to traditional zinc. Fully interchangeable with OEM part 806190A, it installs easily onto the sterndrive leg using existing hardware.
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$ 18.84
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1-2 weeks delivery time The Osculati 43.424.31 – Mercruiser 806190A Magnesium Leg Anode is designed to provide superior galvanic corrosion protection for Mercruiser Bravo and Blackhawk sterndrives operating in freshwater. Cast from high-purity magnesium, this anode offers the highest electrochemical activity among sacrificial anode materials, making it ideal for low-conductivity environments. It replaces OEM part 806190A and mounts directly to the sterndrive leg with precision fit and reliable long-term performance.
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$ 28.59
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1-2 weeks delivery time The Osculati 43.424.01 – Mercruiser 806189A Zinc Leg Anode is a direct replacement sacrificial anode for Mercruiser Alpha One sterndrives, specifically designed for use in saltwater environments. Manufactured from high-quality zinc, this anode effectively protects the sterndrive’s leg from galvanic corrosion by diverting electrical current away from exposed metal components. It matches OEM part 806189A and fits securely with precise bolt-hole alignment, ensuring reliable long-term performance.
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$ 12.89
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1-2 weeks delivery time The Osculati 43.424.22 – Mercruiser 806189A Aluminium Leg Anode is engineered for Mercruiser Alpha One sterndrives and intended for use in brackish and saltwater environments. This aluminium version of the leg-mounted sacrificial anode provides long-lasting protection against galvanic corrosion while offering a lighter alternative to traditional zinc. It is a direct-fit replacement for OEM part 806189A and delivers excellent electrochemical performance with reduced environmental impact.
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$ 9.39
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1-2 weeks delivery time The Osculati 43.424.23 – Mercruiser 806189A Magnesium Leg Anode is a high-activity sacrificial anode tailored for Mercruiser Alpha One sterndrives operating in freshwater environments. Made from high-purity magnesium, this anode ensures maximum galvanic protection by sacrificing itself to prevent corrosion of critical underwater components. Fully compatible with OEM part 806189A, it features precise mounting geometry and enhanced electrochemical efficiency for low-conductivity water conditions.
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$ 17.62
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1-2 weeks delivery time The Osculati 43.424.20 zinc rod anode is designed as a direct-fit replacement for Mercury Verado outboards using OEM part 8M00-12083. This zinc anode offers robust galvanic protection in saltwater environments, effectively shielding the motor’s internal cooling passages and metallic components from corrosion. Its rod-shaped profile ensures a secure fit within the engine’s anode housing and complies fully with original manufacturer specifications.
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$ 39.36
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1-2 weeks delivery time Designed for Mercury Verado outboards, the Osculati 43.424.21 aluminium rod anode (OEM ref. 8M00-12083) is ideal for brackish and saltwater environments. Its cylindrical shape allows precise placement within the engine’s internal passages, where it delivers targeted galvanic protection. Lighter than zinc and offering a higher current capacity per gram, this anode is suitable for users seeking optimal protection with extended durability and reduced environmental impact.
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$ 31.85
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1-2 weeks delivery time The Osculati 43.239.13 is a zinc washer anode designed to protect Mercury and Tohatsu outboard components from galvanic corrosion. Compatible with Mercury OEM 823913 and Tohatsu 369-60218-1, it features a compact 24 × 6.5 mm profile ideal for installation on bolts, shafts, or propeller hardware. This sacrificial anode is a critical element in preserving engine integrity in saltwater use.
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$ 15.17
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1-2 weeks delivery time The Osculati 43.239.14 is an aluminium washer-style anode designed for Mercury and Tohatsu outboards, with direct compatibility to OEM references 823913 and 369-60218-1. Featuring a 24 mm outer diameter and 6.5 mm center hole, this compact sacrificial anode protects bolts, prop shafts, and submerged fittings from galvanic corrosion in salt and brackish waters. Lightweight and long-lasting, it's ideal for modern outboard installations.
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$ 8.63
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1-2 weeks delivery time The Osculati 43.239.15 is a magnesium washer anode designed for Mercury and Tohatsu outboard motors, fully compatible with OEM references 823913 and 369-60218-1. With a 24 mm outer diameter and 6.5 mm center hole, it delivers high-efficiency galvanic protection in freshwater environments. Ideal for shafts, bolts, or threaded submerged components where maximum reactivity is required.
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$ 15.29
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1-2 weeks delivery time The Osculati 43.824.92 aluminium ring anode (Ø 20×7 mm) is a compact corrosion protection solution designed as a direct replacement for Mercury OEM part 823912-1. Ideal for saltwater and brackish environments, this cadmium-free aluminium anode is suitable for shafts, studs, and internal engine fittings, delivering lightweight, long-lasting galvanic defense.
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$ 11.28
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1-2 weeks delivery time Zinc base support anode for MerCruiser sterndrives, designed for threaded mounts with 12×1.75 mm pitch. With an outer diameter of 22/25 mm and a length of 35 mm, this anode is optimized for saltwater environments to prevent galvanic corrosion at the base of the stern drive. Constructed from high-purity zinc, this component ensures long-lasting protection and straightforward replacement.
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$ 32.67
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1-2 weeks delivery time Zinc base support anode compatible with MerCruiser Alpha and Bravo sterndrive units, matching OEM reference 55989A3. Designed for use with 120–160 HP foot housings, it features a 33 mm outer diameter, 29 mm length, and 1/2" UNC threaded connection. This high-purity zinc anode offers reliable corrosion protection in saltwater, extending the service life of the sterndrive's base assembly.
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$ 13.15
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1-2 weeks delivery time Aluminium base support anode compatible with MerCruiser Alpha and Bravo sterndrives, matching OEM reference 55989A3. Designed for 120–160 HP sterndrive models, it features a 33 mm outer diameter, 29 mm length, and 1/2" UNC thread. This lightweight aluminium version offers excellent galvanic protection in saltwater and brackish conditions, with improved efficiency compared to traditional zinc.
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$ 9.31
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1-2 weeks delivery time High-efficiency magnesium base support anode for MerCruiser Alpha and Bravo sterndrives, OEM reference 55989A3. Engineered for 120–160 HP models with 1/2" UNC threaded interface, this anode features 33 mm diameter and 29 mm length. Ideal for freshwater use, magnesium offers the most active galvanic protection among sacrificial anode materials, ensuring reliable corrosion control for critical lower unit components.
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$ 15.03
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What is an outboard engine anode, and how does it protect a motor from galvanic corrosion?
An outboard engine anode is a sacrificial metal component, such as a trim tab anode or shaft anode, designed to protect the motor from galvanic corrosion by attracting corrosive elements in the water. Installed on parts like the motor's ventilation plate, transom bracket, or propeller shaft, the anode corrodes instead of critical engine components, extending the lifespan of the outboard motor, especially in saltwater and brackish environments. Regular anode replacement ensures continuous protection for the boat motor and other submerged parts.
What is the importance of regularly replacing outboard motor anodes for corrosion protection?
Regularly replacing outboard motor anodes is essential to prevent galvanic corrosion, which can damage critical components like the engine, propeller, and transom bracket. Sacrificial anodes, such as bar anodes, trim tab zinc anodes, and ring anodes, corrode instead of the motor, protecting metal parts from deterioration in saltwater, brackish water, and freshwater. Using the correct alloy anode ensures long-term protection for outboards and boat zinc components, extending the engine’s lifespan and maintaining performance.
What factors determine the choice between aluminum, magnesium and zinc anode for boats?
The choice between zinc, aluminum, and magnesium anodes depends on the water environment where the boat operates. Zinc anodes are ideal for saltwater, aluminum anodes provide effective protection in both saltwater and brackish water, while magnesium anodes are best suited for freshwater. Using the correct anode ensures that essential components like outboard engines, transom brackets, and skegs are protected from galvanic corrosion, extending the lifespan of boat anodes and motor parts.
Additionally, proper maintenance of the cooling system, including timely Honda Impeller Replacement, helps prevent overheating and ensures efficient engine operation.