Marine anodes, including zinc, aluminum, and magnesium anodes, are sacrificial metal components used to protect the hull and underwater metal parts of boats and yachts from galvanic corrosion. By corroding preferentially, the anodes help protect more valuable submerged components such as hull fittings, propeller shafts, rudders, trim tabs, and other bonded metal parts.
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1-2 weeks delivery time Allpa 9077962 magnesium round sacrificial anodes for marine rudders, supplied as a pair of two Ø125 mm discs. The double configuration is designed for installation on the rudder blade, with a listed weight of 0.32 kg for the product.
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$ 53.18
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1-2 weeks delivery time Allpa round zinc sacrificial anodes for marine rudders, supplied as single disc anodes and available in diameters from Ø50 to Ø125 mm. The range includes Ø50, Ø70, Ø90, Ø110 and Ø125 mm versions, with weights of 0.30 kg for Ø70 mm, 0.60 kg for Ø90 mm and 1.35 kg for Ø125 mm.
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$ 9.08
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1-2 weeks delivery time Allpa round zinc sacrificial anodes for marine rudders, supplied as matched pairs for installation on both sides of the rudder blade. The range includes Ø70, Ø90 and Ø125 mm versions, with each set consisting of two round disc anodes.
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$ 16.19
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1-2 weeks delivery time Allpa aluminium weld-on hull sacrificial anodes with integrated welding strips, available in four sizes from 0.60 to 2.20 kg. Catalogue dimensions are specified in a x b x c x h format and range from 110x60x190x28 mm to 290x80x390x40 mm. The series includes Allpa 9077005, 9077015, 9077025 and 9077035, all manufactured from aluminium for weld-on hull installation.
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$ 19.80
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1-2 weeks delivery time Allpa aluminium weld-on hull sacrificial anodes with integrated welding strips, available in three sizes from 0.25 to 1.00 kg. Allpa 9077000 measures 203x120x40x25 mm and weighs 0.25 kg, 9077010 measures 260x178x60x30 mm and weighs 0.55 kg, while 9077020 measures 340x231x76x35 mm and weighs 1.00 kg. Catalogue dimensions are specified in a x b x c x d format.
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$ 19.80
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1-2 weeks delivery time Allpa magnesium weld-on hull sacrificial anodes with integrated welding strips, available in three sizes from 0.30 to 1.30 kg. Allpa 9077935 measures 110x60x190x28 mm and weighs 0.30 kg, 9077936 measures 180x65x300x30 mm and weighs 0.75 kg, while 9077937 measures 290x80x460x40 mm and weighs 1.30 kg. Catalogue dimensions are specified in a x b x c x h format.
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$ 30.36
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1-2 weeks delivery time Allpa zinc weld-on hull sacrificial anodes with integrated welding strips, available in five sizes from 0.60 to 3.00 kg. Catalogue dimensions range from 100x60x190x20 mm to 150x90x250x40 mm in a x b x c x h format. The range includes Allpa 9077405, 9077415, 9077425, 9077435 and 9077445, all manufactured from zinc for weld-on hull installations.
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$ 19.14
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1-2 weeks delivery time Allpa zinc weld-on hull sacrificial anodes from the former series, supplied with integrated welding strips and available in three sizes. Allpa 9077400 measures 203x120x40x25 mm and weighs 0.55 kg, 9077410 measures 260x178x60x30 mm and weighs 1.13 kg, while 9077420 measures 340x231x76x35 mm and weighs 2.42 kg. All variants are manufactured from zinc for weld-on marine hull installation.
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$ 19.14
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1-2 weeks delivery time Allpa Grouper sacrificial anodes supplied with a 4.5 m cable and available in zinc, aluminium and magnesium versions. Allpa 9017520 is the zinc model weighing 2.69 kg, 9017520A is the aluminium model weighing 1.22 kg, and 9017520M is the magnesium model weighing 0.95 kg. The cable must not be connected to the battery.
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$ 126.27
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1-2 weeks delivery time Allpa Bonding Kit sacrificial anodes designed for installation between two Z-drive units. The range includes Allpa 9017525 in zinc and Allpa 9017525A in aluminium, allowing the appropriate anode material to be selected for the installation.
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$ 290.97
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1-2 weeks delivery time Tecnoseal zinc Bosvik propeller anodes supplied complete with stainless steel retaining ring, available for shaft diameters from Ø20 to Ø50 mm. Depending on the version, dimension l ranges from 25 to 55 mm, height h from 45 to 52 mm and outside diameter from Ø49 to Ø76 mm. Individual weights range from 0.40 to 0.75 kg. Select the required version according to shaft diameter and anode dimensions.
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$ 82.88
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1-2 weeks delivery time Tecnoseal zinc Dufour shaft ring anodes available in three sizes with outside diameters of Ø47, Ø52 and Ø55 mm. Depending on the model, height h ranges from 12 to 18 mm, dimension i from 37 to 43 mm and Ø1 from 27 to 32 mm, while all versions share Ø2 6.5 mm and Ø3 10 mm dimensions. Individual weights are 0.09, 0.14 and 0.18 kg. Select the required version according to outside diameter, height and the detailed mounting dimensions.
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$ 85.50
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1-2 weeks delivery time Tecnoseal propeller anodes for the Riva Acquariva series, available in zinc and magnesium versions for a Ø40 mm shaft. Both models share the same dimensions: Ø48 mm outside diameter, 51 mm height, a 24 mm, Ø1 35 mm, Ø2 10 mm, Ø3 15 mm and Ø4 4 mm. Tecnoseal 00433 is the zinc version weighing 0.44 kg, while 00433MG is the magnesium version weighing 0.11 kg.
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$ 59.50
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1-2 weeks delivery time Tecnoseal aluminium propeller anodes for Solé Diesel installations, available for shaft sizes Ø25, Ø30, Ø35–40 and Ø45–50 mm. Depending on the model, the anodes measure Ø32–55 mm in outside diameter and 39–70 mm in height, with individual weights from 0.05 to 0.22 kg. Corresponding Solé original part numbers are 40025092, 40030092, 40035092 and 40045092. Select the required version according to shaft diameter and matching anode dimensions.
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$ 16.29
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1-2 weeks delivery time Tecnoseal Teignbridge propeller anodes for the Cranchi series, supplied as anode only and available in zinc and magnesium versions. Both models share the same dimensions: a 47 mm, b 45 mm, h 85 mm, Ø68 mm, Ø1 54 mm and Ø2 21 mm. Tecnoseal 00405Q is the zinc version weighing 0.99 kg, while 00405QMG is the magnesium version weighing 0.25 kg. Original part number: MSF2226.
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$ 88.03
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1-2 weeks delivery time Tecnoseal Teignbridge propeller anodes for the Cranchi series, supplied complete with brass and available in zinc and magnesium versions. Both models measure Ø75 mm with h 33 mm and h1 35 mm and feature an M36x3 thread. Tecnoseal 00415Q is the zinc version weighing 2.19 kg, while 00415QMG is the magnesium version weighing 0.56 kg. Original part number: ASF2225.
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$ 402.21
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1-2 weeks delivery time Tecnoseal magnesium Renault Marine type propeller nut anodes for shaft sizes from Ø22–25 mm up to Ø40/50 mm. The range includes thread options 16x2, 20x2.5, 28x2.5, M20, M24, M27, M30, 20x2, 26x2, 27x1.5, 30x1.5 and 36x1.5. Depending on the model, the anodes measure 36–54 mm in height and Ø27–50 mm in outside diameter, with individual weights from 0.02 to 0.11 kg. Select the required version according to shaft size and thread specification.
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$ 45.05
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1-2 weeks delivery time Tecnoseal 00400CROX zinc propeller anode for Nordhavn 40–55 ft vessels. The anode weighs 0.99 kg and measures Ø78 mm overall with a height of 56 mm. Additional catalogue dimensions are a 26 mm, b 11 mm, Ø1 50 mm, Ø2 27 mm and Ø3 10 mm. Manufactured from zinc (ZN).
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$ 78.19
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1-2 weeks delivery time Tecnoseal zinc propeller anodes for the Orvea series, available in three sizes with outside diameters of Ø56, Ø65 and Ø81 mm. The models measure 85, 101 and 110 mm in height respectively, with Ø1 dimensions from 42 to 60 mm. Individual weights range from 0.64 to 1.59 kg. Select the required version according to outside diameter, height, Ø1 dimension and weight.
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$ 92.91
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1-2 weeks delivery time Tecnoseal zinc Reggiani propeller anodes available for shaft diameters from Ø20 to Ø60 mm. Depending on the model, the anodes measure 30–85 mm in height with outside diameters from Ø20 to Ø88 mm, Ø1 dimensions from 15 to 55 mm and Ø2 dimensions from 6.5 to 11 mm. Individual weights range from 0.09 to 2.40 kg. Select the required version according to shaft diameter and matching anode dimensions.
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$ 23.50
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How do Aluminum, Zinc, and Magnesium Anodes differ in protecting a boat?
Aluminum, zinc, and magnesium anodes all provide cathodic protection by acting as sacrificial metals, but their effectiveness depends on the water type and their electrochemical potential. Zinc anodes are traditionally used in saltwater and provide reliable protection in high-salinity environments. Aluminum anodes are more electrochemically active than zinc and offer a higher protective capacity for their weight, making them suitable for saltwater and brackish water and, with the correct alloy, many freshwater applications. Magnesium is the most active of the three materials and is primarily intended for freshwater, where its higher driving voltage provides effective protection in low-conductivity conditions. Magnesium anodes should generally not be used in saltwater or brackish water, as they may provide excessive protection and be consumed too rapidly.
Why is anode placement on the hull plate important for effective corrosion protection?
Correct anode placement is essential because sacrificial anodes must be electrically connected to the metal they protect and positioned where protective current can reach exposed underwater surfaces effectively. On metal hulls, anodes should be distributed around areas that are most susceptible to galvanic corrosion, including the hull plating, rudder, propeller shaft, stern gear, and other submerged metal components. Poorly positioned, undersized, or electrically isolated anodes may leave parts of the structure insufficiently protected. Proper distribution helps maintain a more uniform protective potential across the underwater metalwork and reduces the risk of localized corrosion.