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 00476 is a zinc sacrificial propeller anode for Ferretti propeller assemblies with a specified shaft size of Ø45 mm. It features a tapered cylindrical body with rounded edges, an outside diameter of 61 mm (2.40 in) and an overall height of 76 mm (2.99 in). Additional mounting dimensions include Ø1 of 41 mm, Ø2 of 25 mm and h1 of 26 mm. Weighing 0.95 kg (2.09 lbs), the anode is designed to provide galvanic corrosion protection for compatible underwater propeller components.
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$ 68.86
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1-2 weeks delivery time The Tecnoseal 00477 is a zinc sacrificial propeller anode for Ferretti marine propeller assemblies with a specified shaft size of Ø50 mm. It features a tapered cylindrical body with an internal sunk key configuration, an outside diameter of 54 mm (2.13 in), and an overall height of 73 mm (2.87 in). Additional mounting dimensions include Ø1 of 45 mm, Ø2 of 15 mm, and h1 of 24 mm. Weighing 0.63 kg (1.39 lbs), this anode provides galvanic corrosion protection for compatible underwater propeller components.
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$ 66.35
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1-2 weeks delivery time Tecnoseal 00478 and 00478AL are sacrificial propeller anodes for Ferretti 620 propeller assemblies, with a specified shaft size of Ø55–70 mm. Available in zinc and aluminium, both versions feature a tapered cylindrical body with rounded edges, an outside diameter of 59 mm, an overall height of 88 mm and an internal recess depth (h1) of 44 mm. The mounting diameters are Ø1 = 40 mm and Ø2 = 18 mm. The zinc version weighs 1.08 kg (2.38 lbs), while the aluminium version weighs 0.44 kg (0.97 lbs).
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$ 98.25
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1-2 weeks delivery time Tecnoseal Ferretti sacrificial propeller anodes are designed for compatible Ferretti yacht propeller assemblies and are available in zinc and aluminium versions. The range includes outside diameters of 155 mm, 202 mm and 235 mm, with corresponding heights of 125 mm, 161 mm and 160 mm. Each anode features a cylindrical body with a recessed internal mounting profile. Depending on the selected model and material, weights range from 5.00 kg to 36.53 kg. The anodes provide sacrificial corrosion protection for compatible underwater propeller components.
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$ 918.13
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1-2 weeks delivery time Tecnoseal 00479E and 00479EAL are sacrificial propeller anodes designed for compatible Ferretti yacht propeller assemblies, featuring a cylindrical body with an internal hexagonal mounting profile. Available in zinc and aluminium, both versions have an outside diameter of 155 mm (6.10 in), an overall height of 125 mm (4.92 in), dimension a of 75 mm (2.95 in), mounting diameter Ø1 of 116 mm (4.57 in), and Ø2 of 14.50 mm (0.57 in). The zinc version weighs 12.50 kg (27.56 lbs), while the aluminium version weighs 5.16 kg (11.38 lbs).
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$ 1,058.18
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1-2 weeks delivery time Tecnoseal 00479EH and 00479EHAL are sacrificial propeller anodes for compatible Ferretti yacht propeller assemblies, featuring a rounded hydro-style external profile and an internal hexagonal mounting recess. Available in zinc and aluminium, both versions measure 155 mm (6.10 in) in outside diameter and 125 mm (4.92 in) in overall height, with dimension a of 75 mm (2.95 in), Ø1 of 116 mm (4.57 in) and Ø2 of 14.50 mm (0.57 in). The zinc 00479EH weighs 8.34 kg (18.39 lbs), while the aluminium 00479EHAL weighs 3.27 kg (7.21 lbs).
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$ 871.33
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1-2 weeks delivery time Tecnoseal 00439-2 and 00439-4 are zinc sacrificial propeller anodes designed for compatible Ferretti yacht propeller assemblies. Both models feature a cylindrical body with a stepped internal mounting recess and an overall height of 140 mm (5.51 in). The 00439-2 measures 159 mm in outside diameter and weighs 14.00 kg, while the 00439-4 measures 190 mm in outside diameter and weighs 22.40 kg. Both versions share dimensions a = 94 mm, b = 12.50 mm, Ø2 = 110 mm, Ø3 = 91 mm and Ø4 = 12.50 mm, with different Ø1 dimensions of 131 mm and 127 mm respectively.
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$ 1,285.99
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1-2 weeks delivery time The Tecnoseal 00439-3 is a zinc sacrificial propeller anode designed for compatible Ferretti yacht propeller assemblies. It features a cylindrical body with a stepped internal mounting recess, an outside diameter of 185 mm (7.28 in) and an overall height of 100 mm (3.94 in). Additional dimensions include a = 65 mm, b = 10 mm, Ø1 = 110 mm, Ø2 = 92 mm and Ø3 = 12.50 mm. Weighing 15.85 kg (34.94 lbs), this anode provides sacrificial corrosion protection for compatible underwater propeller components.
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$ 1,510.19
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1-2 weeks delivery time The Tecnoseal 00439-5 is a zinc sacrificial propeller anode designed for compatible Ferretti yacht propeller assemblies. It features a cylindrical body with a stepped internal mounting recess, an outside diameter of 200 mm (7.87 in) and an overall height of 130 mm (5.12 in). Additional mounting dimensions include a = 90 mm, Ø1 = 165 mm, Ø2 = 140 mm and Ø3 = 17 mm. Weighing 19.00 kg (41.89 lbs), this anode provides galvanic corrosion protection for compatible underwater propeller components.
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$ 2,118.76
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1-2 weeks delivery time The Tecnoseal 19023 is a zinc sacrificial propeller anode for Franchini 55 yachts, designed to protect compatible underwater propeller components against galvanic corrosion. It features a cylindrical body with a recessed internal mounting profile, an outside diameter of 87 mm (3.43 in), a height of 45 mm (1.77 in) and a mounting hole spacing of 64 mm (2.52 in). Additional dimensions include Ø1 = 64 mm, Ø2 = 40 mm and Ø3 = 6 mm. The anode weighs 1.00 kg (2.20 lbs).
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$ 1,406.45
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1-2 weeks delivery time The Tecnoseal 01045 is a zinc sacrificial propeller anode designed for compatible Leopard yacht propeller assemblies. It features a rounded, tapered external body with a stepped internal mounting recess, an outside diameter of 70 mm (2.76 in) and an overall height of 60 mm (2.36 in). The anode also has an Ø1 dimension of 8 mm (0.31 in) and weighs 1.10 kg (2.43 lbs). It is intended to provide galvanic corrosion protection for compatible underwater propeller components.
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$ 193.03
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1-2 weeks delivery time The Tecnoseal 19022 is a zinc sacrificial propeller anode designed for Leopard 23 yachts, providing corrosion protection for compatible underwater propeller components. Its cylindrical body features a recessed internal mounting profile and three mounting holes. The anode measures 90 mm (3.54 in) in outside diameter and 60 mm (2.36 in) in overall height, with internal diameters of 64 mm (Ø1) and 45 mm (Ø2), mounting hole diameter of 6.50 mm and hole spacing of 64 mm. Additional profile dimensions include a = 5 mm and b = 29 mm. The anode weighs 1.90 kg (4.19 lbs).
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$ 1,197.94
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1-2 weeks delivery time The Tecnoseal 19030 is a zinc sacrificial propeller anode designed for compatible Magellano yacht propeller assemblies, providing corrosion protection for underwater metallic components. Its cylindrical body features a flat outer face, a recessed internal mounting cavity and a stepped circular profile around the opening. The anode measures 157 mm (6.18 in) in outside diameter and 96 mm (3.78 in) in overall height, with an internal diameter (Ø1) of 100 mm (3.94 in). Weighing 8.30 kg (18.30 lbs), it is intended as a replacement sacrificial anode for compatible Magellano propeller installations.
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$ 1,571.95
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1-2 weeks delivery time Tecnoseal 00435 and 00435-1 are zinc sacrificial propeller anodes designed for Riva Mercurius and Riva Ego yacht propeller assemblies. Both feature a cylindrical body with a recessed stepped mounting cavity and an outside diameter of 116 mm (4.57 in). The 00435 for Riva Mercurius measures 86 mm in height, with an internal diameter of 88 mm, dimension c of 26 mm and weight of 4.86 kg. The 00435-1 for Riva Ego measures 92 mm in height, with an internal diameter of 87 mm, dimension c of 8.50 mm and weight of 5.00 kg. Both versions have a 22 mm central opening and provide sacrificial corrosion protection for compatible underwater propeller components.
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$ 678.41
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1-2 weeks delivery time Tecnoseal 00436 and 00436-1 are zinc sacrificial propeller anodes designed for compatible Riva Mercurius II yacht propeller assemblies. Both feature a cylindrical body with a recessed stepped mounting cavity and central fastening opening, providing galvanic corrosion protection for underwater propeller components. The 00436 measures 155 mm in outside diameter and 95 mm in overall height, with a 132 mm dimension i and a weight of 10.34 kg. The 00436-1 measures 156 mm in outside diameter and 100 mm in overall height, with a 130 mm dimension i and a weight of 11.60 kg. Both versions have an Ø1 diameter of 116 mm, while their Ø2 and Ø3 dimensions differ.
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$ 1,009.21
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1-2 weeks delivery time The Tecnoseal 00437 is a zinc sacrificial propeller anode designed for Riva Splendida and Riva Splendida Piccola yacht propeller assemblies. Its tapered cylindrical body features a recessed internal mounting cavity, an outside diameter of 140 mm (5.51 in) and an overall height of 125 mm (4.92 in). The mounting profile includes an internal diameter (Ø2) of 93 mm, an Ø1 dimension of 13 mm, and additional diameters Ø3 = 26 mm and Ø4 = 10.50 mm. With a specified dimension i of 110 mm and a weight of 7.05 kg (15.54 lbs), this zinc anode provides sacrificial corrosion protection for compatible underwater propeller components.
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$ 1,111.14
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1-2 weeks delivery time Tecnoseal 00438 and 00439 are zinc sacrificial propeller anodes for compatible Riva Opera, Riva Dolce Vita and Riva Opera 80 yacht propeller assemblies. Both feature a cylindrical body with a recessed internal mounting cavity and a central fastening opening. The 00438 measures 120 mm in outside diameter and 90 mm in overall height, with a 99 mm mounting dimension (i), an internal recess diameter (Ø2) of 80 mm and a weight of 4.80 kg. The larger 00439 measures 171 mm in outside diameter and 100 mm in height, with a 110 mm mounting dimension (i), an internal recess diameter (Ø2) of 92 mm and a weight of 12.92 kg. Both zinc anodes provide sacrificial corrosion protection for compatible underwater propeller components.
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$ 430.15
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1-2 weeks delivery time The Tecnoseal 00408/Z is a zinc sacrificial propeller anode designed for compatible Riva Sarnico yacht propeller assemblies. It features a cylindrical body with a recessed internal mounting cavity, a stepped internal profile and a central fastening opening. Measuring 140 mm (5.51 in) in outside diameter and 100 mm (3.94 in) in overall height, the anode incorporates a 92 mm (3.62 in) internal recess diameter (Ø2), 13 mm diameters at Ø1 and Ø3, and a 28 mm Ø4 dimension. Weighing 7.70 kg (16.98 lbs), this zinc anode provides sacrificial corrosion protection for compatible underwater propeller components.
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$ 739.54
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1-2 weeks delivery time Tecnoseal San Lorenzo zinc propeller anodes are sacrificial corrosion protection components designed for compatible San Lorenzo yacht propeller assemblies. Available in four versions with outside diameters of 185, 190, 225 and 241 mm, they feature cylindrical bodies with recessed internal mounting cavities and circular mounting profiles. The 19025 measures 185 mm in diameter and 75 mm in height, weighing 7.73 kg; the 19026 measures 190 mm in diameter and 95 mm in height, weighing 8.70 kg. The larger 19027 and 19027-1 both have an overall height of 130 mm, with outside diameters of 225 and 241 mm and weights of 16.80 and 21.50 kg respectively. Each variant incorporates specific internal diameters and mounting hole dimensions for matching the corresponding propeller installation.
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$ 1,365.12
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1-2 weeks delivery time The Tecnoseal 19012-4 is a zinc sacrificial propeller anode designed for compatible San Lorenzo yacht propeller assemblies. Its low-profile circular body features a flat mounting surface, a raised central section and a fastening hole for attachment to the corresponding propeller component. The anode measures 130 mm (5.12 in) in outside diameter and 25 mm (0.98 in) in overall height, with a central diameter (Ø1) of 60 mm (2.36 in), a fastening hole diameter (Ø2) of 8 mm (0.31 in) and an additional height measurement (h1) of 21 mm (0.83 in). Manufactured from zinc and weighing 2.05 kg (4.52 lbs), it provides sacrificial corrosion protection for compatible underwater propeller components.
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$ 505.39
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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.