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 19012-5 is a zinc sacrificial propeller anode from the Detra series, designed to provide galvanic corrosion protection for compatible marine propeller assemblies. It features a solid circular body with a rounded outer profile and a stepped mounting surface, measuring 125 mm (4.92 in) in outside diameter and 46 mm (1.81 in) in overall height. The anode has a secondary diameter (Ø1) of 105 mm (4.13 in) and a profile dimension (a) of 18 mm (0.71 in). Manufactured from zinc and weighing 3.35 kg (7.39 lbs), it is intended as a replaceable sacrificial component for compatible Detra propeller installations.
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$ 729.78
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1-2 weeks delivery time The Tecnoseal 19031 is a zinc sacrificial propeller anode designed for compatible Servogear marine propulsion assemblies. It features a circular ring-shaped body with a tapered internal opening and multiple mounting holes arranged around the inner circumference. The anode measures 150 mm (5.91 in) in outside diameter and 65 mm (2.56 in) in height, with an internal diameter (Ø1) of 92 mm (3.62 in), a mounting hole diameter (Ø2) of 12 mm (0.47 in) and a mounting dimension (i) of 100 mm (3.94 in). Manufactured from zinc and weighing 3.37 kg (7.43 lbs), it serves as a replaceable sacrificial component for galvanic corrosion protection in compatible propeller installations.
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$ 1,775.60
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1-2 weeks delivery time Tecnoseal Turian zinc propeller anodes are circular sacrificial anodes designed for compatible San Lorenzo, Canados and Admiral yacht propeller assemblies. The range includes six variants with outside diameters from 125 to 169 mm, heights of 21 or 25 mm and mounting hole diameters of 8.5, 10.5 or 12.5 mm. Each anode features a flat circular body with four mounting holes arranged around its circumference. The mounting dimension (i) varies from 80 to 150 mm depending on the model, while individual weights range from 2.00 to 3.94 kg. Manufactured from zinc, these anodes provide sacrificial galvanic corrosion protection for electrically connected underwater metallic propulsion components.
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$ 408.28
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1-2 weeks delivery time The Tecnoseal 00430VLT is a zinc sacrificial propeller anode designed for compatible VLT marine propeller assemblies. It features a cylindrical body with a recessed internal mounting cavity and three fastening holes arranged around its circular face. The anode measures 130 mm (5.12 in) in outside diameter and 90 mm (3.54 in) in overall height, with an internal diameter (Ø1) of 115 mm (4.53 in), mounting hole diameter (Ø2) of 8.50 mm (0.33 in), mounting dimension (i) of 84 mm (3.31 in) and internal dimension (a) of 55 mm (2.17 in). Manufactured from zinc and weighing 4.30 kg (9.48 lbs), it provides sacrificial corrosion protection for electrically connected underwater propeller components.
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$ 1,048.83
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1-2 weeks delivery time The Tecnoseal 00431VLT is a zinc sacrificial propeller anode designed for compatible VLT marine propeller assemblies. It features a cylindrical body with a recessed internal mounting cavity and three fastening holes arranged around the circular end face. The anode measures 140 mm (5.51 in) in outside diameter and 105 mm (4.13 in) in overall height, with an internal mounting profile defined by Ø1 = 103 mm, Ø2 = 100 mm, dimension a = 57 mm and dimension b = 18 mm. The mounting configuration includes a 105 mm dimension (i) and 10 mm fastening holes (Ø3). Manufactured from zinc and weighing 6.92 kg (15.26 lbs), it provides sacrificial galvanic corrosion protection for compatible underwater propeller components.
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$ 623.47
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1-2 weeks delivery time The Tecnoseal 00432VLT is a zinc sacrificial propeller anode from the VLT series, designed for compatible marine propeller assemblies. It features a low-profile circular body with three fastening holes arranged around the face and a recessed mounting section on the underside. The anode measures 155 mm (6.10 in) in outside diameter and 30 mm (1.18 in) in overall height, with a mounting diameter (Ø1) of 91 mm (3.58 in), a mounting dimension (i) of 113 mm (4.45 in) and fastening hole diameters (Ø2) of 10.50 mm (0.41 in). Manufactured from zinc and weighing 3.67 kg (8.09 lbs), it provides sacrificial galvanic corrosion protection for electrically connected underwater propeller components.
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$ 356.29
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1-2 weeks delivery time The Tecnoseal AUTOH5 is a zinc sacrificial propeller anode designed for Bruntons Autoprop H5 feathering propellers. It features a compact, dome-shaped body with three mounting lugs and fastening holes, providing a replaceable corrosion protection component for the propeller assembly. The anode measures 55 mm (2.17 in) across dimension a and 32 mm (1.26 in) in overall height, with a 21 mm (0.83 in) dimension b, 41 mm (1.61 in) mounting dimension i, 34 mm (1.34 in) base diameter, 27 mm (1.06 in) internal diameter and 7 mm (0.28 in) mounting holes. Manufactured from zinc and weighing 0.17 kg (0.37 lbs), it is designed to provide sacrificial protection against galvanic corrosion for compatible propeller components.
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$ 66.42
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1-2 weeks delivery time The Tecnoseal AUTOH6 is a zinc sacrificial propeller anode designed for Bruntons Autoprop H6 feathering propellers. It features a dome-shaped body with three integrated mounting lugs and fastening holes, providing a replaceable corrosion protection component for the propeller assembly. The anode measures 67 mm (2.64 in) across dimension a and 45 mm (1.77 in) in overall height, with a 30 mm (1.18 in) dimension b, 49 mm (1.93 in) mounting dimension i, and specified diameters of 43 mm (Ø), 34 mm (Ø1), 19 mm (Ø2) and 9 mm (Ø3). Manufactured from zinc and weighing 0.37 kg (0.82 lbs), it provides sacrificial galvanic corrosion protection for compatible underwater propeller components.
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$ 78.99
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1-2 weeks delivery time The Tecnoseal AUTOH20 is a zinc sacrificial propeller anode designed for Bruntons Autoprop H20 propeller assemblies. It features a compact rounded dome with a two-hole mounting flange and a recessed circular mounting opening. The anode measures 60 mm in overall diameter and 33 mm in height, with a body width (a) of 50 mm, mounting dimension (i) of 49 mm, internal opening diameter (Ø1) of 35 mm and mounting hole diameter (Ø2) of 6.5 mm. Weighing 0.18 kg, this replaceable zinc anode provides sacrificial galvanic corrosion protection for electrically connected metallic propeller components.
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$ 66.42
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1-2 weeks delivery time The Tecnoseal ATS-S1 is a zinc sacrificial propeller anode designed for Autostream S1 and S2 series three-blade feathering propellers. Its compact dome-shaped body incorporates a central fastening opening and a circular mounting base, providing a replaceable corrosion protection component for compatible propeller assemblies. The anode measures 58 mm (2.28 in) in outside diameter and 37 mm (1.46 in) in height, with a 23 mm (0.91 in) diameter (Ø1) and a 10 mm (0.39 in) fastening hole (Ø2). Manufactured from zinc and weighing 0.50 kg (1.10 lbs), it helps protect electrically connected underwater metallic propeller components against galvanic corrosion.
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$ 50.54
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1-2 weeks delivery time Tecnoseal 01040 and 01040MG are sacrificial propeller nut anodes designed for Flexofold folding propellers, replacing original Flexofold parts #112 and #117 respectively. They are compatible with Flexofold 2-blade closed propellers, 3-blade propellers and 4-blade propellers up to 23 inches, as specified by the manufacturer. Both versions feature a conical dome-shaped body with three mounting holes, an outside diameter of 70 mm, an overall height of 37 mm, a mounting dimension (i) of 50 mm and an 8 mm central hole (Ø2). The zinc version 01040 weighs 0.48 kg, while the magnesium version 01040MG weighs 0.12 kg. The two materials provide alternative sacrificial corrosion protection options for compatible propeller installations.
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$ 49.74
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1-2 weeks delivery time The Tecnoseal 01041 and 01041MG are sacrificial propeller nut anodes designed for compatible Flex-O-Fold folding propeller assemblies. Available in zinc and magnesium, both versions feature a compact triangular body with three mounting holes and a central fastening opening. The anodes measure 56 mm (2.20 in) in overall dimension (a), 10 mm (0.39 in) in height and 39 mm (1.54 in) across the mounting dimension (i), with an additional profile dimension (b) of 8 mm (0.31 in). The central opening diameter (Ø) is 14 mm (0.55 in), while the fastening holes (Ø1) measure 9 mm (0.35 in). The zinc version 01041 weighs 0.32 kg (0.71 lbs), while the magnesium version 01041MG weighs 0.08 kg (0.18 lbs). Both are intended as replaceable sacrificial components for galvanic corrosion protection in compatible propeller installations.
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$ 69.78
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1-2 weeks delivery time Tecnoseal 01042 and 01042AL are sacrificial side anodes designed for Flex-O-Fold folding propellers, supplied in pairs of two. They are compatible with Flexofold 2-blade closed propellers, 3-blade propellers and 4-blade propellers up to 23 inches. Each anode features a circular body with a recessed central mounting hole, measuring 32 mm in outside diameter, 13 mm in height and 6 mm in mounting hole diameter. The zinc version 01042 replaces original Flexofold part #114 and weighs 0.12 kg, while the aluminium version 01042AL replaces original part #118 and weighs 0.05 kg. Both variants provide sacrificial galvanic corrosion protection for compatible folding propeller assemblies.
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$ 45.43
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1-2 weeks delivery time Tecnoseal 01043 and 01043AL are sacrificial side anodes designed for Flex-O-Fold 2-blade composite folding propellers, supplied in pairs of two. The zinc version 01043 corresponds to original Flexofold part #119, while the aluminium version 01043AL replaces original part #120. Each anode features a compact contoured rectangular body with a recessed central mounting hole, measuring 37 mm (1.46 in) in length, 23 mm (0.91 in) in width and 16 mm (0.63 in) in height. The mounting configuration includes a 10 mm (0.39 in) recess diameter and a 6 mm (0.24 in) fastening hole. The zinc version weighs 0.13 kg (0.29 lbs), while the aluminium version weighs 0.04 kg (0.09 lbs), providing alternative sacrificial materials for compatible Flexofold propeller installations.
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$ 62.09
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1-2 weeks delivery time The Tecnoseal 01044 is a zinc sacrificial propeller nut anode designed for compatible Flex-O-Fold folding propeller assemblies. It features a rounded conical body with a central fastening opening and four mounting holes arranged around its circular base. The anode measures 85 mm (3.35 in) in outside diameter and 48 mm (1.89 in) in overall height, with a mounting dimension (i) of 58 mm (2.28 in). Manufactured from zinc and weighing 1.04 kg (2.29 lbs), it serves as a replaceable sacrificial component that helps protect electrically connected underwater metallic propeller parts against galvanic corrosion.
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$ 143.05
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1-2 weeks delivery time The Tecnoseal 01023 is a zinc sacrificial collar anode designed for GORI 2-blade Saildrive propellers in the 13–18 inch size range, corresponding to original GORI part number 15670000. The anode features a curved collar body with mounting holes for attachment to the compatible propeller assembly. Its technical dimensions include a length (l) of 98 mm (3.86 in), width (a) of 40 mm (1.57 in), mounting dimension (i) of 79 mm (3.11 in), and hole diameters of 11 mm (Ø) and 6.50 mm (Ø1). Manufactured from zinc and weighing 0.58 kg (1.28 lbs), it provides sacrificial galvanic corrosion protection for electrically connected underwater metallic components of compatible GORI propeller systems.
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$ 93.81
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1-2 weeks delivery time Tecnoseal 01025 and 01024 are zinc sacrificial collar anodes designed for GORI 3-blade Saildrive propellers, corresponding to original GORI part numbers 15527500 and 15539500. Both versions feature a curved split-collar body with fastening holes for installation on compatible propeller assemblies. The 01025 version fits 15–16.5 inch propellers and measures 81 mm in length, 24 mm in width and 56 mm across mounting dimension i, with a catalogue weight of 0.36 kg. The larger 01024 version fits 18–20 inch propellers and measures 95 mm in length, 34 mm in width and 59 mm across mounting dimension i, weighing 0.92 kg. Manufactured from zinc, these replaceable anodes provide sacrificial galvanic corrosion protection for electrically connected underwater metallic propeller components.
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$ 93.81
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1-2 weeks delivery time Tecnoseal 01029, 01026, 01020 and 01027 are zinc sacrificial collar anodes designed for GORI 3-blade Saildrive propellers, corresponding to original GORI part numbers 1552000, 1553000, 1554000 and 1550000. These anodes feature a split cylindrical collar construction with fastening holes for attachment to compatible propeller assemblies. Four sizes are available for 15–16 inch, 18–20 inch, 22–26 inch and 28–30 inch propellers, with catalogue lengths ranging from 65 to 127 mm, widths from 34 to 50 mm, mounting dimensions (i) from 45 to 90 mm, and weights from 0.33 to 2.12 kg. Manufactured from zinc, they serve as replaceable sacrificial components that help protect electrically connected underwater metallic propeller parts against galvanic corrosion.
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$ 93.81
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1-2 weeks delivery time Tecnoseal 01022, 01022/1, 01021 and 01028 are zinc sacrificial propeller nut anodes designed for compatible GORI propeller assemblies, replacing original GORI parts 14072100, 14073100, 14074100 and 14074511 respectively. These compact, rounded triangular anodes feature a central recessed fastening opening and are available for GORI propellers in the 15–16.5, 18–20, 22–26 and 28–30 inch size ranges. Depending on the variant, the overall dimension (l) ranges from 27 to 44 mm, height (h) from 16 to 33 mm, central hole diameter (Ø) from 6 to 8.5 mm and recessed diameter (Ø1) from 12 to 14 mm. Manufactured from zinc, the anodes weigh between 0.04 and 0.27 kg and provide sacrificial corrosion protection for compatible underwater metallic propeller components.
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$ 29.17
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1-2 weeks delivery time Tecnoseal 01030, 01030MG, 01031 and 01032 are sacrificial propeller nut anodes designed for compatible J-Prop feathering propeller assemblies. Featuring a rounded, dome-shaped body with a recessed central fastening opening, the range includes three outside diameters: 60 mm, 79 mm and 89 mm. The 60 mm version is available in zinc (01030, 0.36 kg) and magnesium (01030MG, 0.12 kg), both measuring 26 mm in height with a 35 mm internal diameter (Ø1). The larger zinc versions measure 79 × 33 mm (01031, 0.76 kg) and 89 × 37 mm (01032, 1.10 kg) in diameter and height respectively. Each anode incorporates the mounting dimensions specified for its corresponding J-Prop configuration and provides replaceable sacrificial corrosion protection for electrically connected underwater metallic propeller components.
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$ 40.57
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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.