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 The Tecnoseal 07115–07200 propeller shaft grounding system is a marine grounding kit containing one brush holder with two graphite brushes and one silver-plated contact ring. Available for shaft diameters from 115 to 200 mm, the range includes two ring configurations: 3 mm (a) × 50 mm (h) for diameters 115–127 mm and 4 mm (a) × 40 mm (h) for diameters 130–200 mm. Kit weights range from 0.78 to 1.12 kg. The graphite brushes provide sliding electrical contact with the ring fitted to the rotating propeller shaft.
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$ 1,406.88
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1-2 weeks delivery time The Tecnoseal SPAZZ3 is a replacement graphite brush for Tecnoseal 07115–07200 propeller shaft grounding systems. It measures 25 × 12 × 32 mm and features an M5 threaded connection for attachment to the brush holder. The brush provides sliding electrical contact with the silver-plated ring fitted to the rotating propeller shaft. Its catalogue weight is 0.23 kg (0.51 lbs).
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$ 127.90
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1-2 weeks delivery time The Tecnoseal 00274E / 00274EAL is a Sealine UK-type bolt-on bar anode for marine corrosion protection, available in zinc and aluminium versions. The anode measures 450 × 100 × 30 mm and features two slotted mounting positions with 230 mm centre-to-centre spacing. Additional mounting dimensions are 48 × 73 mm (b) and 44 mm (c). The zinc version weighs 7.20 kg, while the aluminium version weighs 3.60 kg.
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$ 370.59
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1-2 weeks delivery time The Tecnoseal 00470 is a zinc sacrificial anode for AKIR series marine propellers. It has an outside diameter of 190 mm, an M164.5x3 thread and a weight of 11.90 kg (26.24 lbs). Additional catalogue dimensions include Ø1 145 mm, Ø2 115 mm, Ø3 15 mm, and measurements a 80 mm, b 20 mm and c 55 mm. Designed for propeller corrosion protection, this anode should be selected according to the existing AKIR propeller assembly and mounting dimensions.
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$ 1,201.74
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1-2 weeks delivery time The Tecnoseal 00471 is a zinc sacrificial anode for AKIR series marine propellers, designed to protect underwater propeller components against galvanic corrosion. It has an outside diameter of 145 mm, an M120x4 thread and a weight of 16.20 kg (35.71 lbs). Additional catalogue dimensions are Ø1 90 mm, a 130 mm, b 50 mm and c 115 mm. The anode has a cylindrical design with a recessed mounting section for the AKIR propeller assembly.
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$ 1,435.45
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1-2 weeks delivery time The Tecnoseal 00472 is a zinc sacrificial anode for AKIR series marine propellers, designed to protect underwater propeller components against galvanic corrosion. It has an outside diameter of 140 mm, internal diameters of 120 mm and 100 mm, and catalogue dimensions a = 70 mm and b = 25 mm. The anode weighs 5.74 kg (12.65 lbs) and features a cylindrical design with a recessed internal mounting section.
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$ 485.87
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1-2 weeks delivery time The Tecnoseal 03450 is a zinc sacrificial propeller anode for AZBE series marine propeller assemblies. It features a conical design with a maximum outside diameter of 53 mm, an overall height of 54 mm and an M22x2.5 internal mounting thread. Additional dimensions include a = 10 mm, b = 11.50 mm and h1 = 43 mm, with an M6 fixing specification. The anode weighs 0.45 kg (0.99 lbs) and is intended for galvanic corrosion protection of compatible propeller components.
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$ 96.52
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1-2 weeks delivery time The Tecnoseal 03451 is a zinc sacrificial anode for AZBE series marine propellers, designed to protect underwater propeller components against galvanic corrosion. It features a tapered cylindrical profile with a maximum outside diameter of 63 mm, an overall height (h1) of 90 mm and an internal recess height (h) of 67 mm. Additional dimensions include Ø1 41 mm, Ø2 14 mm and Ø3 8 mm. The anode weighs 1.02 kg (2.25 lbs).
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$ 132.49
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1-2 weeks delivery time The Tecnoseal DETRA series zinc propeller anodes are designed for Azimut-Benetti marine propeller assemblies, providing sacrificial protection against galvanic corrosion. Available in three sizes with outside diameters of 143, 178 and 240 mm, the anodes feature a circular profile with a recessed mounting base. Depending on the model, overall height ranges from 47 to 52 mm, base diameter from 127 to 220 mm, and weight from 4.87 to 15.50 kg. Select the appropriate size according to the dimensions of the existing propeller anode.
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$ 761.58
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1-2 weeks delivery time The Tecnoseal 19011-1 is a zinc sacrificial propeller anode for Azimut-Benetti marine propeller assemblies, designed to protect underwater metallic components against galvanic corrosion. It has an outside diameter of 164 mm, an overall height of 100 mm and a recessed mounting section with a diameter of 114 mm. The anode features two 16.50 mm fixing holes with 140 mm centre-to-centre spacing, a recess dimension (a) of 50 mm and a weight of 11.10 kg (24.47 lbs).
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$ 1,136.37
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1-2 weeks delivery time The Tecnoseal 19012 is a zinc sacrificial propeller anode for Azimut-Benetti marine propeller assemblies, designed to provide galvanic corrosion protection for underwater metallic components. It features a cylindrical, flanged configuration with an outside diameter of 160 mm, internal diameters of 118 mm and 140 mm, and a profile dimension (a) of 57 mm. Four 6.50 mm mounting holes are positioned on a 180 mm pitch circle. The anode weighs 10.15 kg (22.38 lbs).
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$ 1,378.89
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1-2 weeks delivery time The Tecnoseal 19012-1 is a zinc sacrificial propeller anode for Azimut-Benetti marine propeller assemblies. It features a circular flanged design with an outside diameter of 180 mm (7.09 in), a height of 40 mm (1.57 in), an additional diameter Ø1 of 140 mm (5.51 in), and four 7 mm (0.28 in) fixing holes. The catalogue mounting dimension (i) is 159 mm, dimension (a) is 20 mm, and the anode weighs 5.80 kg (12.79 lbs). It is intended to provide galvanic corrosion protection for compatible underwater propeller components.
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$ 1,434.04
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1-2 weeks delivery time The Tecnoseal 19012-2 is a zinc sacrificial propeller anode designed for Azimut-Benetti marine propeller assemblies. It features a cylindrical body with a recessed mounting section, an outside diameter of 220 mm (8.66 in), an overall height of 110 mm (4.33 in), and four fixing holes with a diameter of 9 mm (0.35 in). Weighing 19.60 kg (43.21 lbs), this anode provides sacrificial corrosion protection for compatible underwater propeller components.
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$ 1,654.68
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1-2 weeks delivery time The Tecnoseal 19020 is a zinc sacrificial propeller anode for Canados 70 yachts, designed to protect compatible underwater propeller components against galvanic corrosion. It features a circular body with an outside diameter of 152 mm, an overall dimension (a) of 60 mm, a recessed profile height (h) of 55 mm, and mounting diameters of 94 mm and 80 mm. Two fixing holes measure 10.50 mm in diameter, with a 125 mm centre-to-centre distance. The anode weighs 6.87 kg (15.15 lbs).
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$ 1,378.89
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1-2 weeks delivery time The Tecnoseal 19021 is a zinc sacrificial propeller anode designed for Canados 72 yachts. It features a circular cylindrical body with a recessed mounting section, an outside diameter of 165 mm (6.50 in), a height of 50 mm (1.97 in), and a mounting diameter Ø1 of 155 mm (6.10 in). The catalogue specifies an M118x3 threaded mounting connection. Weighing 6.00 kg (13.23 lbs), this anode is intended to provide galvanic corrosion protection for compatible underwater propeller components.
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$ 1,351.36
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1-2 weeks delivery time The Tecnoseal 19013 is a zinc sacrificial propeller anode designed for Codecasa yacht propeller assemblies. It features a cylindrical body with a recessed mounting section, an outside diameter of 180 mm, mounting diameters of 117 mm and 90 mm, and four 10 mm fixing holes. Additional catalogue dimensions are a = 29 mm, b = 83 mm and i = 140 mm. Weighing 16.00 kg (35.27 lbs), the anode provides sacrificial corrosion protection for compatible underwater propeller components.
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$ 1,378.89
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1-2 weeks delivery time The Tecnoseal 19014 is a zinc sacrificial propeller anode designed for Codecasa yacht propeller assemblies. It features a cylindrical body with a recessed mounting section, an outside diameter of 120 mm (4.72 in) and an overall height of 90 mm (3.54 in). The internal mounting dimensions include Ø1 of 88 mm, Ø2 of 55 mm and a recess depth (a) of 30 mm, with additional diameters Ø3 of 19 mm and Ø4 of 12.50 mm. The anode weighs 5.40 kg (11.90 lbs) and provides galvanic corrosion protection for compatible underwater propeller components.
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$ 1,185.85
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1-2 weeks delivery time The Tecnoseal 00400COR is a zinc sacrificial propeller anode designed for Cortese propeller assemblies. It features a cylindrical body with a recessed mounting section, an outside diameter of 150 mm (5.91 in), an overall height (a) of 50 mm (1.97 in), and a recessed profile height (h) of 30 mm (1.18 in). The mounting section has a diameter Ø1 of 73 mm (2.87 in), and three fixing holes with a diameter Ø2 of 10.50 mm (0.41 in). Weighing 5.25 kg (11.57 lbs), the anode provides galvanic corrosion protection for compatible underwater propeller components.
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$ 829.42
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1-2 weeks delivery time The Tecnoseal 00409/2 is a zinc sacrificial propeller anode designed for Dalla Pietà yacht propeller assemblies. It features a cylindrical body with a shaped internal mounting recess, an outside diameter of 147 mm (5.79 in), an overall height of 135 mm (5.31 in), and mounting dimensions of 123 mm (a) and 107 mm (b). The catalogue also specifies a mounting dimension (i) of 125 mm and a fixing hole diameter (Ø1) of 9 mm. Weighing 10.00 kg (22.05 lbs), this anode provides galvanic corrosion protection for compatible underwater propeller components.
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$ 969.32
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1-2 weeks delivery time Tecnoseal Ferretti zinc sacrificial propeller anodes with guide holes are designed for compatible Ferretti marine propeller assemblies. Available in two sizes, the 00475 model measures 51 mm in diameter and 67 mm in height, weighing 0.59 kg, while the 00478/1 measures 74 mm in diameter and 96 mm in height, weighing 1.89 kg. Both feature a tapered cylindrical profile, an internal mounting recess and a 4.50 mm guide hole. These anodes provide galvanic corrosion protection for compatible underwater propeller components.
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$ 58.42
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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.