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 Tecnoseal magnesium Teardrop Type bolt-on sacrificial anodes with integrated mounting strap and slotted fixing holes. The range includes four models weighing from 0.36 to 1.00 kg, with anode body dimensions from 120 × 78 × 25 mm to 160 × 100 × 40 mm. All versions have a 200 mm mounting dimension i, with slotted holes of 13 × 25 or 13 × 35 mm and strap sizes of 250 × 25 × 5 mm or 255 × 25 × 5 mm. Select the required version according to body dimensions, slot size, weight and strap dimensions.
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$ 42.97
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1-2 weeks delivery time Tecnoseal magnesium large disc sacrificial anodes with steel insert for hull and transom applications. The range includes four models with outside diameters from Ø150 to Ø230 mm, heights from 25 to 32 mm and weights from 0.70 to 2.20 kg. All available magnesium versions feature a Ø14 mm central mounting hole. Select the required model according to outside diameter, height and anode weight.
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$ 300.41
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1-2 weeks delivery time Tecnoseal magnesium stern disc sacrificial anodes for stern applications, available either as anode only without insert or as complete kits with mounting components. The range covers Ø125 and Ø140 mm outside diameters, heights from 30 to 38 mm and weights from 0.68 to 1.13 kg depending on size and supply configuration. All versions feature Ø1 50 mm, Ø2 14.5 mm and Ø3 48 mm dimensions. Complete kits include the corresponding stern disc anode together with 00153-PERNOCOMPLETO, nut, PP cap and pad. Tecnoseal 00140MG corresponds to Osculati 43.210.22 and Tecnoseal 00131MG corresponds to Osculati 43.210.23. Select the required version according to diameter, height, weight and supply configuration.
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$ 130.45
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1-2 weeks delivery time Tecnoseal 00150MG magnesium stern disc sacrificial anode supplied as anode only, without insert. The anode measures Ø100 x 40 mm and weighs 0.51 kg. Technical dimensions include Ø1 40 mm and Ø2 12.5 mm. Designed for stern applications and suitable for replacement where these dimensions match the existing installation.
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$ 106.63
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1-2 weeks delivery time Tecnoseal magnesium Baglietto-type stern disc sacrificial anodes with steel insert for stern applications, available in two supply configurations. Tecnoseal 00152MG is supplied as anode only with PP cap and weighs 0.98 kg, while Tecnoseal 00153MG is supplied as a complete 1.21 kg kit comprising the stern disc anode together with 00153-PERNOCOMPLETO / nut, PP cap and pad. Both versions measure Ø135 x 47 mm and share dimensions a 35 mm, b 9 mm, Ø1 50x3 mm, Ø2 32 mm and Ø3 14.5 mm.
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$ 266.89
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1-2 weeks delivery time Tecnoseal magnesium Baglietto-type stern disc sacrificial anodes with steel insert for stern applications. The range includes two versions with the same Ø120 x 35 mm body dimensions and insert dimensions Ø1 50x3 mm, Ø2 32 mm and Ø3 14 mm. Available as anode only (00154MG, 0.55 kg) or as a complete kit (00154CMG, 0.78 kg) supplied with 00153-PERNOCOMPLETO / nut, PP cap and pad.
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$ 164.87
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1-2 weeks delivery time Tecnoseal magnesium Vetus-type oval plate bolt-on sacrificial anodes for hull and transom applications. The range includes five models from 98 to 350 mm in length, 44 to 68 mm in width and 18 to 36 mm in height, with weights from 0.10 to 1.25 kg. Tecnoseal 00220-0MG, also referenced as Osculati 43.902.15, is the compact 98 x 44 x 18 mm version with 48.5 mm hole centres and Ø10.5 mm mounting holes. The larger models feature hole-centre distances from 80 to 200 mm, with Ø1 dimensions of 31–38 mm and slotted Ø2 mounting holes of 11x15 or 13x25 mm. Tecnoseal 00220MG is also referenced as Osculati 43.902.30. Select the required model according to overall dimensions, hole-centre distance, mounting dimensions and weight.
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$ 37.62
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1-2 weeks delivery time Tecnoseal magnesium UK-Type bolt-on bar sacrificial anodes for Fairline hull and transom applications, available in two configurations. Tecnoseal 00269EMG measures 200 x 65 x 32 mm, weighs 0.45 kg and features 110 mm hole centres with Ø12 mm mounting holes. Tecnoseal 00270EMG measures 320 mm in length and 65 mm in width, weighs 0.70 kg and features 160 mm hole centres, 33 mm height, b 92 mm and c 12x65 mm mounting dimensions. Select the required model according to overall dimensions, hole-centre distance and weight.
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$ 37.58
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1-2 weeks delivery time Tecnoseal magnesium UK-Type bolt-on bar sacrificial anodes for Fairline hull and transom applications, available in two sizes. Tecnoseal 00271E/MG measures 310 x 75 x 40 mm, weighs 1.16 kg and features 205 mm hole centres, b 35 mm and c 13x25 mm mounting dimensions. Tecnoseal 00272EMG measures 455 x 94 x 40 mm, weighs 1.96 kg and features 230 mm hole centres, Ø 19x30 mm and Ø1 70 mm mounting dimensions. Select the required model according to overall dimensions, mounting configuration, hole-centre distance and weight.
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$ 133.56
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1-2 weeks delivery time Tecnoseal 00273EMG magnesium UK-Type bolt-on bar sacrificial anode for Sunseeker hull and transom applications. The anode measures 450 x 105 x 50 mm, weighs 2.72 kg and features 230 mm hole centres. Mounting dimensions are Ø 19x30 mm with Ø1 70 mm. Select this model where the overall dimensions and mounting configuration match the existing installation.
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$ 429.68
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1-2 weeks delivery time Tecnoseal 03503MG magnesium Vetus-Type conical plate sacrificial anode for hull and transom applications. The anode measures Ø79 x 45 mm and weighs 0.30 kg. Technical dimensions include Ø1 11 mm, Ø2 46 mm and Ø3 34 mm. Select this model where the overall diameter, height and mounting dimensions match the existing installation.
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$ 96.01
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1-2 weeks delivery time Tecnoseal zinc sacrificial anodes for rudders, flaps and trim tabs, available in oval, double oval and teardrop plate configurations. The range includes five sizes from 85 × 47 × 20 mm to 145 × 41 × 23 mm, with weights from 190 g to 530 g and fixing hole centre distances from 33 to 52 mm. Tecnoseal models 00203 and 00204 correspond to Osculati references 43.701.00 and 43.702.00 respectively.
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$ 21.62
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1-2 weeks delivery time Tecnoseal zinc UK Type disc sacrificial anodes with insert for rudders and trim tabs, supplied individually without mounting hardware. The range includes 00101UK with Ø70 × 33 mm dimensions and 430 g weight, 00102UK with 98 × 82 × 32 mm dimensions and 1.00 kg weight, and 00105UK with Ø148 × 36 mm dimensions and 2.08 kg weight. Depending on the model, Ø1 ranges from 30 to 42 mm and Ø2 from 11 to 14.5 mm.
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$ 34.42
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1-2 weeks delivery time Tecnoseal zinc Scandinavian Type bolt-on sacrificial anodes with stainless steel strap, available in weights from 0.25 to 5.50 kg. The range includes multiple body and strap configurations with body lengths from 75 to 260 mm, overall dimensions i from 117 to 315 mm, mounting slots from 7 × 25 to 13 × 35 mm and stainless steel straps from 150 × 20 × 3 to 340 × 25 × 5 mm. Select the required version according to body dimensions, mounting slot size and strap dimensions.
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$ 24.33
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1-2 weeks delivery time Tecnoseal zinc Oval Type bolt-on sacrificial anodes with integrated mounting strap and slotted fixing holes. The range includes eight models weighing from 0.60 to 5.00 kg, with anode body dimensions from 100 × 60 × 18 mm to 300 × 80 × 40 mm, mounting dimension i from 160 to 355 mm and slotted holes from 12 × 20 to 13 × 40 mm. Strap sizes range from 200 × 25 × 5 mm to 400 × 30 × 6 mm. Select the required version according to body dimensions, mounting dimension, slot size and strap dimensions.
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$ 80.93
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1-2 weeks delivery time Tecnoseal zinc Teardrop Type bolt-on sacrificial anodes with mounting strap and slotted fixing holes. The range includes five models weighing from 1.00 to 3.10 kg, with anode body dimensions from 120 × 78 × 25 mm to 160 × 100 × 40 mm, mounting dimension i of 200 or 220 mm and slotted holes of 13 × 25 or 13 × 35 mm. Strap sizes are 250 × 25 × 5 mm or 255 × 25 × 5 mm. Select the required version according to body dimensions, mounting dimension i, slot size and strap dimensions.
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$ 41.35
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1-2 weeks delivery time Tecnoseal zinc large disc sacrificial anodes with steel insert for hull and transom applications. The range includes nine models with outside diameters from Ø150 to Ø300 mm, heights from 25 to 35 mm and weights from 2.80 to 11.90 kg. Central hole diameters are Ø14, Ø16 or Ø17.5 mm depending on the model. Select the required version according to outside diameter, height, central hole diameter and anode weight.
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$ 178.50
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1-2 weeks delivery time Tecnoseal zinc stern disc sacrificial anodes for stern applications, available either as anode only without insert or as complete kits with mounting components. The range covers Ø125 and Ø140 mm outside diameters, heights from 30 to 38 mm and weights from 2.69 to 3.35 kg depending on size and supply configuration. All versions feature Ø1 50 mm, Ø2 14.5 mm and Ø3 48 mm dimensions. Complete kits include the corresponding zinc disc anode together with 00153-PERNOCOMPLETO / nut, PP cap and pad. Tecnoseal 00140 corresponds to Osculati 43.210.02 and Tecnoseal 00131 corresponds to Osculati 43.210.03. Select the required version according to diameter, height, weight and supply configuration.
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$ 188.97
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1-2 weeks delivery time Tecnoseal zinc stern disc sacrificial anodes supplied as anode only, without insert. The range includes four models with outside diameters from Ø100 to Ø145 mm, heights from 25 to 40 mm and weights from 1.88 to 4.00 kg. Available configurations feature Ø1 dimensions of 38 or 40 mm and Ø2 mounting-hole diameters from 10 to 12.5 mm. Tecnoseal 00155 is also listed as equivalent to Tecnoseal 02462. Select the required version according to outside diameter, height, mounting dimensions and weight.
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$ 135.20
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1-2 weeks delivery time Tecnoseal zinc Baglietto-type stern disc sacrificial anodes with steel insert for stern applications, available in two supply configurations. Tecnoseal 00152 is supplied as anode only with PP cap and weighs 3.91 kg, while Tecnoseal 00153 is supplied as a complete 4.14 kg kit comprising 00152 together with 00153-PERNOCOMPLETO / nut, PP cap and pad. Both versions measure Ø135 x 47 mm and share dimensions a 35 mm, b 9 mm, Ø1 50x3 mm, Ø2 32 mm and Ø3 14.5 mm.
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$ 347.68
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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.