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 E. Polipodio zinc anode for rudders and flaps, model FX-3V, measuring 250 x 65 x 28 mm and weighing 2.40 kg. The anode features two mounting points with 140 mm centre-to-centre spacing, with the catalogue drawing specifying Ø11x15 and Ø11 mounting-hole dimensions. Manufactured from zinc (ZN) for rudder and flap installations.
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$ 92.60
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1-2 weeks delivery time E. Polipodio zinc anode for rudders and flaps, model FD-1, measuring 150 x 45 x 20 mm. The anode features two Ø7 mm mounting holes positioned 52 mm centre-to-centre. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120205.
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$ 17.07
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1-2 weeks delivery time E. Polipodio NC032 zinc anode for rudders and flaps, model FD-2, measuring 85 x 45 x 20 mm. The anode features two Ø7 mm mounting holes positioned 33 mm centre-to-centre. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120203.
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$ 12.50
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1-2 weeks delivery time E. Polipodio NC058 zinc anode for hull and transom applications, measuring 100 x 50 x 10 mm. The rectangular anode features two mounting holes positioned 50 mm centre-to-centre, with an 8 mm hole dimension shown in the catalogue drawing. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120105.
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$ 19.96
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1-2 weeks delivery time E. Polipodio ZX038 zinc anode for Fairline and Sunseeker hull and transom applications, model FX-7L. The anode measures 447 x 90 x 40 mm and weighs 7.00 kg. It features two mounting points with 231 mm centre-to-centre spacing and Ø19x28 mounting-hole dimensions according to the catalogue drawing. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120023.
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$ 186.55
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1-2 weeks delivery time E. Polipodio ZX020 zinc anode for Fairline hull and transom applications, model FX-3D/ZN. The anode measures 320 x 65 x 35 mm and weighs 2.40 kg. It features two elongated mounting slots positioned 160 mm centre-to-centre, with slot dimensions Ø12x65 mm according to the catalogue drawing. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120412.
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$ 90.99
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1-2 weeks delivery time E. Polipodio ZX010B zinc anode for hull and transom applications, model FX-5B, weighing 4.00 kg. The anode measures 325 mm in length and 80 mm in width, with two mounting holes positioned 200 mm centre-to-centre. The catalogue drawing specifies Ø16x26 mm mounting-hole dimensions. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120420.
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$ 104.29
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1-2 weeks delivery time E. Polipodio ZX011 zinc anode for hull and transom applications, model FX-4, measuring 220 x 110 x 30 mm and weighing 4.00 kg. The anode features two elongated 13x20 mm mounting slots positioned 130 mm centre-to-centre and includes an insert according to the catalogue drawing. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120413.
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$ 110.11
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1-2 weeks delivery time E. Polipodio ZX012 zinc anode for hull applications, model FX-3, measuring 290 x 55 x 30 mm and weighing 3.00 kg. The anode features two mounting holes positioned 200 mm centre-to-centre. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120320.
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$ 84.22
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1-2 weeks delivery time E. Polipodio ZX013 zinc anode for hull applications, model FX-2, measuring 190 x 55 x 25 mm and weighing 1.60 kg. The anode features two mounting holes positioned 75 mm centre-to-centre, with Ø12x15 mm mounting-hole dimensions according to the catalogue drawing. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120257.
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$ 51.81
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1-2 weeks delivery time E. Polipodio ZX017 zinc anode for hull applications, model FX-1, measuring 115 x 65 x 30 mm and weighing 1.00 kg. The anode features two Ø11 mm mounting holes positioned 40 mm centre-to-centre. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120304.
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$ 39.69
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1-2 weeks delivery time E. Polipodio zinc anode for hull applications, model FB-3, measuring 210 x 70 x 25 mm and weighing 2.00 kg. The anode features two Ø18 mm mounting holes positioned 80 mm centre-to-centre. Manufactured from zinc (ZN) for hull installations.
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$ 76.68
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1-2 weeks delivery time E. Polipodio NC015 zinc anode for Riva hull applications, model FR-160, measuring 220 x 60 x 30 mm and weighing 2.80 kg. The anode features two Ø9 mm mounting holes positioned 160 mm centre-to-centre. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120316.
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$ 100.57
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1-2 weeks delivery time E. Polipodio NC045 zinc anode for hull applications, model FC-P, supplied complete with threaded plug. The anode measures 245 x 80 x 40 mm, weighs 4.00 kg and features a central Ø14 mm opening according to the catalogue drawing. Manufactured from zinc (ZN) and cross-referenced in the Trem catalogue as L8120404.
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$ 208.75
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1-2 weeks delivery time E. Polipodio stern round flange anodes available in three dimensional configurations with outside diameters from Ø120 to Ø140 mm. NC069 measures Ø120 x 35 mm with Ø14 mm internal diameter, NC005 measures Ø136 x 55 mm with Ø16 mm internal diameter, and NC014 measures Ø140 x 40 mm with Ø14 mm internal diameter. The corresponding Trem references are L8100154, L8110150 and L8120214. Select the required version according to outside diameter, internal diameter and overall height.
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$ 124.45
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1-2 weeks delivery time E. Polipodio VT012 threaded bronze pin with Ø12 mm diameter, cross-referenced in the Trem catalogue as N0112039. The assembly features threaded ends together with nuts and washers as shown in the catalogue image. Manufactured from bronze for use as a fastening component.
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$ 63.10
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1-2 weeks delivery time E. Polipodio zinc bar anodes available in diameters from Ø10 to Ø35 mm and lengths of 400 or 500 mm. The Ø10, Ø12, Ø14, Ø16 and Ø20 versions are 400 mm long with weights from 0.22 to 0.95 kg, while the Ø25, Ø30 and Ø35 versions are 500 mm long with weights from 1.70 to 3.30 kg. All variants are manufactured from zinc (ZN). Select the required version according to bar diameter, length and weight.
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$ 14.08
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1-2 weeks delivery time E. Polipodio zinc anodes for hull and transom applications, available in six sizes from Ø50 to Ø140 mm. Depending on the model, anode thickness ranges from 12 to 26 mm and the central mounting-hole diameter from Ø8 to Ø12 mm. The range includes NC023 Ø50x12 with Ø8 hole, NC024 Ø70x17 with Ø8 hole, NC025 Ø90x20 with Ø8 hole, NC026 Ø110x25 with Ø10 hole, NC027 Ø125x22 with Ø10 hole and NC028 Ø140x26 with Ø12 hole. All versions are manufactured from zinc (ZN).
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$ 4.21
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1-2 weeks delivery time E. Polipodio aluminium weld-on sacrificial anodes for hull applications, available in three sizes from 0.6 to 1.8 kg. The range includes anode body dimensions of 110 × 60 × 28 mm, 200 × 70 × 25 mm and 200 × 90 × 35 mm, with total lengths of 190 or 300 mm. Select the required version according to body dimensions, total length and anode weight.
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$ 22.96
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1-2 weeks delivery time E. Polipodio zinc weld-on sacrificial anodes for hull applications, available in four sizes from 0.6 to 4.0 kg. The range includes anode body dimensions from 110 × 60 × 12 mm to 200 × 90 × 35 mm, with total lengths from 190 to 300 mm. Each version is manufactured with an extended mounting strip for weld-on installation. Select the required model according to anode dimensions, total length and weight.
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$ 22.84
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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.