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 43.822.16 aluminium fin anode is an OEM-equivalent replacement for Mercury 25 to 50 HP outboards (2-stroke and 4-stroke), referencing part 822157-C2. Designed to mount beneath the anti-ventilation plate, this torque tab anode delivers effective corrosion protection in saltwater and brackish environments, while also providing steering torque compensation. Aluminium alloy offers longer life, lower weight, and reduced environmental impact compared to zinc.
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$ 37.42
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1-2 weeks delivery time The Osculati 43.822.17 magnesium fin anode is designed for Mercury 25 to 50 HP 2-stroke and 4-stroke outboards, replacing OEM part 822157-C2. Ideal for freshwater use, it combines lightweight construction and maximum reactivity to protect the engine’s lower unit from galvanic corrosion. Its integrated torque tab helps offset propeller forces for improved directional stability.
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$ 40.18
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1-2 weeks delivery time The Osculati 43.227.77 is a fin-style anode for Mercury outboard engines and sterndrives from 35 to 225 HP, compatible with OEM reference 822777. Designed for models from 1995 onward, it protects submerged components from galvanic corrosion. Suitable for salt and brackish water, this fin anode also contributes to steering balance on compatible models.
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$ 61.67
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1-2 weeks delivery time The Osculati 43.425.00 zinc fin anode is a direct-fit replacement for Mercury outboards and stern drives using OEM reference 34127. Designed in a hydrodynamic fin shape, it offers both corrosion protection and steering torque compensation. Constructed from high-purity zinc, this anode performs reliably in saltwater environments and mounts securely beneath the anti-ventilation plate or cavitation plate on compatible Mercury lower units.
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$ 39.36
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1-2 weeks delivery time The Osculati 43.433.03 zinc anode is specifically designed for Mercury 4 and 6 HP outboards, replacing OEM part 875208. Ideal for saltwater environments, this anode safeguards small engine components by redirecting galvanic activity away from critical metals. Compact and easy to install, it offers reliable corrosion protection for the lower unit and exhaust plate.
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$ 14.66
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1-2 weeks delivery time The Osculati 43.433.04 aluminium anode is a lightweight and high-efficiency corrosion protection component designed for Mercury 4 and 6 HP outboards, fully compatible with OEM part 875208. Its aluminium alloy composition makes it suitable for saltwater and brackish water use, offering longer service life and reduced environmental impact compared to zinc alternatives.
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$ 10.21
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1-2 weeks delivery time OEM-equivalent zinc anode designed for MerCruiser Bravo I sterndrive systems, matching reference 806188A. Installed on the propeller shaft bracket, this anode offers robust corrosion protection for underwater metal components exposed to saltwater. Manufactured from high-grade zinc for optimal sacrificial action, it ensures long-term durability and direct fitment without modification.
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$ 54.40
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1-2 weeks delivery time OEM-compatible aluminium anode for MerCruiser Bravo I sterndrive units, equivalent to reference 806188A. Designed to protect the propeller shaft bracket against galvanic corrosion, this anode offers superior performance in saltwater and brackish environments. Manufactured from a high-efficiency aluminium alloy, it provides longer service life and reduced environmental impact compared to zinc.
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$ 39.99
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1-2 weeks delivery time OEM-spec magnesium anode for MerCruiser Bravo I sterndrive systems, matching reference 806188A. Mounted on the propeller shaft bracket, this anode provides maximum galvanic protection in freshwater environments. With high electrochemical activity, magnesium is ideal where conductivity is low, ensuring superior corrosion resistance and long-term durability of submerged metal components.
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$ 41.69
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1-2 weeks delivery time The Osculati 43.252.71 is a rod-style anode designed for Mercury 2-stroke and 4-stroke outboard engines from 25 to 40 HP. Fully interchangeable with OEM part number 825271, this internal anode protects the cooling system and internal metal components from galvanic corrosion. Ideal for long-term engine health in both saltwater and brackish environments.
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$ 40.89
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1-2 weeks delivery time The Osculati 43.433.01 zinc anode is a direct replacement for Mercury 6 to 15 HP outboards using OEM part 42121. Designed for effective corrosion protection of small engine lower units, this anode is made of high-purity zinc for maximum performance in saltwater. Its compact form factor ensures a precise fit on smaller outboards, offering essential protection against galvanic damage.
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$ 15.95
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1-2 weeks delivery time The Osculati 43.435.10 – Mercruiser 815933A1 / 821629A1 Zinc Plate Anode is a direct OEM replacement designed for Mercruiser Alpha One sterndrives. Cast from marine-grade zinc, this plate anode ensures reliable protection of submerged components against galvanic corrosion in saltwater environments. Its flat, low-profile design fits perfectly under the trim tab area or on the drive plate, delivering long-lasting electrochemical protection. Compatible with both OEM references: 815933A1 and 821629A1.
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$ 60.70
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1-2 weeks delivery time The Osculati 43.435.11 – Mercruiser 815933A1 / 821629A1 Aluminium Plate Anode is a lightweight, eco-friendly alternative to zinc for protecting Mercruiser Alpha One sterndrives in saltwater and brackish environments. Made from a high-performance aluminium-zinc-indium alloy, this flat plate anode is a direct replacement for OEM references 815933A1 and 821629A1. It offers extended protection against galvanic corrosion with reduced environmental impact and longer service life.
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$ 33.89
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1-2 weeks delivery time The Osculati 43.435.12 – Mercruiser 815933A1 / 821629A1 Magnesium Plate Anode is a high-activity freshwater sacrificial anode designed to protect Mercruiser Alpha One sterndrives. Made from high-purity magnesium, this flat plate anode replaces OEM parts 815933A1 and 821629A1 and offers superior corrosion protection in low-conductivity environments such as lakes and rivers. It features a low-profile design and pre-drilled holes for quick and accurate installation.
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$ 43.83
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1-2 weeks delivery time The Osculati 43.434.10 zinc anode is designed for Mercury 2-stroke and 4-stroke outboards from 30 to 200 HP, including Superamerica models, and corresponds to OEM part 818298A1. Featuring four bores for secure attachment to engine rods or brackets, this anode delivers critical saltwater corrosion protection. Its solid marine-grade zinc construction ensures high durability in aggressive marine environments.
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$ 39.46
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1-2 weeks delivery time The Osculati 43.434.11 aluminium anode is an OEM-equivalent corrosion protection solution for Mercury 2-stroke and 4-stroke outboards from 30 to 200 HP, including Superamerica variants. Replacing Mercury part 818298A1, it features a four-bore configuration for reliable attachment to engine rods or brackets. Made from cadmium-free aluminium alloy, this anode offers enhanced protection in saltwater and brackish water environments, with longer life and reduced environmental impact compared to zinc.
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$ 30.89
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1-2 weeks delivery time The Osculati 43.434.12 magnesium anode is specifically designed for Mercury outboards from 30 to 200 HP, including both 2-stroke and 4-stroke engines and Superamerica models. It replaces OEM part 818298A1 and features a 4-bore configuration for stable mounting on engine rods or brackets. Ideal for freshwater operation, this high-purity magnesium alloy anode offers the most active galvanic protection available, making it the top choice for low-conductivity environments.
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$ 35.22
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1-2 weeks delivery time The Osculati 43.435.20 – Mercruiser 821630A/C Zinc Plate Anode is a flat-profile sacrificial anode designed for Mercruiser Bravo sterndrives operating in saltwater. Cast from marine-grade zinc, it provides effective galvanic corrosion protection for submerged metal components by serving as the primary point of electrochemical wear. Fully interchangeable with OEM references 821630A and 821630C, this anode ensures long-lasting performance and easy installation.
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$ 64.50
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1-2 weeks delivery time The Osculati 43.435.21 – Mercruiser 821630A/C Aluminium Plate Anode is a lightweight and long-lasting sacrificial anode designed for Mercruiser Bravo sterndrives operating in saltwater and brackish conditions. Made from a marine-grade aluminium-zinc-indium alloy, this flat plate anode offers excellent protection from galvanic corrosion while being more environmentally friendly than zinc. It is a direct-fit replacement for OEM part numbers 821630A and 821630C.
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$ 37.70
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1-2 weeks delivery time High-performance magnesium plate anode designed specifically for MerCruiser Bravo drives (reference 821630A/C). Ideal for freshwater environments, this anode provides superior protection against galvanic corrosion. Manufactured to OEM standards, it ensures a perfect fit and efficient performance. Dimensions: approx. 124 × 70 × 13 mm. Mounting hardware not included.
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$ 49.44
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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.