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 00480, 00481 and 00482 are zinc sacrificial propeller anodes designed for compatible Max Prop feathering propellers with hub diameters of 63, 70 and 83 mm respectively. Each anode features a tapered, rounded body with three mounting holes positioned around a central opening. The 00480 version for a 63 mm hub measures 65 mm in outside diameter and 42 mm in height, weighing 0.28 kg. The 00481 version for a 70 mm hub measures Ø72 × 44 mm and weighs 0.38 kg, while the larger 00482 for an 83 mm hub measures Ø83 × 61 mm and weighs 0.81 kg. All three variants are manufactured from zinc and provide replaceable sacrificial corrosion protection for electrically connected underwater metallic components of compatible Max Prop propeller assemblies.
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$ 49.74
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1-2 weeks delivery time The Tecnoseal 00487 and 00488 are zinc sacrificial propeller anodes designed for compatible Max Prop variable-pitch propeller assemblies with hub diameters of 63 mm and 70 mm respectively. Both feature a tapered, conical body with a recessed mounting base and three fastening holes. The 00487 version for a 63 mm hub measures 60 mm in outside diameter and 40 mm in height, with a mounting dimension (i) of 43 mm, an internal diameter (Ø1) of 39 mm and a weight of 0.26 kg (0.57 lbs). The larger 00488 version for a 70 mm hub measures 68 mm in outside diameter and 43 mm in height, with a mounting dimension (i) of 51 mm, an internal diameter (Ø1) of 44 mm and a weight of 0.56 kg (1.23 lbs). Both zinc anodes provide replaceable sacrificial galvanic corrosion protection for electrically connected underwater metallic components of compatible Max Prop systems.
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$ 60.84
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1-2 weeks delivery time Tecnoseal 00480/6, 00480-6MG, 00481/6, 00481-6MG, 00482/6 and 00482-6MG are sacrificial propeller anodes for compatible Max Prop assemblies with six-hole mounting configurations. Available in zinc and magnesium, the range covers 63 mm (MP63R), 70 mm (MP70R) and 83 mm (MP83R) propeller hubs. The anodes feature a rounded conical body and a circular mounting base with six fastening holes. The 63 mm hub versions measure Ø61 × 38 mm and weigh 0.26 kg in zinc or 0.07 kg in magnesium; the 70 mm versions measure Ø68 × 44 mm and weigh 0.41 kg or 0.10 kg; and the 83 mm versions measure Ø80 × 56 mm and weigh 0.82 kg or 0.21 kg respectively. Each size has its own mounting geometry, providing replaceable sacrificial corrosion protection for electrically connected underwater metallic components of compatible Max Prop propeller systems.
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$ 24.58
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1-2 weeks delivery time Tecnoseal 00483 and 00488-1 are zinc sacrificial propeller anodes designed for compatible Max Prop assemblies with a 100 mm propeller hub and three-hole mounting configuration. Both feature a tapered, rounded body with a recessed mounting cavity, but differ in their external dimensions and fastening geometry. The 00483 measures 100 mm (3.94 in) in outside diameter and 60 mm (2.36 in) in height, with a mounting dimension (i) of 72 mm, an internal diameter (Ø1) of 52 mm and a weight of 1.08 kg (2.38 lbs). The 00488-1 measures 92 mm (3.62 in) in outside diameter and 68 mm (2.68 in) in height, with a mounting dimension (i) of 65 mm, the same 52 mm internal diameter and a weight of 1.00 kg (2.20 lbs). Both zinc anodes provide replaceable sacrificial corrosion protection for electrically connected underwater metallic components of compatible Max Prop propeller systems.
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$ 121.41
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1-2 weeks delivery time Tecnoseal 00486 and 00486-1 are zinc sacrificial propeller anodes designed for compatible Max Prop feathering propeller assemblies with hub diameters of 125 mm and 150 mm respectively. Both feature a rounded conical body with three mounting holes positioned around the base. The 00486 version for a 125 mm propeller hub measures 130 mm in outside diameter and 79 mm in height, with a mounting dimension (i) of 85 mm, an internal diameter (Ø1) of 81 mm and a mounting hole diameter (Ø2) of 10 mm. It weighs 1.69 kg (3.73 lbs). The larger 00486-1 version for a 150 mm propeller hub measures 151 mm in outside diameter and 60 mm in height, with a mounting dimension (i) of 113 mm, internal diameter of 101 mm and mounting hole diameter of 10 mm. It weighs 3.17 kg (6.99 lbs). Both versions provide sacrificial galvanic corrosion protection for electrically connected underwater metallic components of compatible Max Prop propeller systems.
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$ 419.35
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1-2 weeks delivery time Tecnoseal 00484 and 00485 are zinc sacrificial collar anodes designed for compatible Max Prop Saildrive propeller assemblies. Both feature a circular collar body with a central opening, split construction and lateral mounting points for attachment to the corresponding propeller component. The two versions share an outside diameter of 92 mm (3.62 in) and an overall height of 25 mm (0.98 in), but differ in their internal diameter: 42 mm (1.65 in) for the 00484 and 46 mm (1.81 in) for the 00485. The respective weights are 0.60 kg (1.32 lbs) and 0.57 kg (1.26 lbs). Manufactured from zinc, these replaceable collar anodes provide sacrificial galvanic corrosion protection for electrically connected underwater metallic components of compatible Max Prop Saildrive systems.
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$ 77.31
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1-2 weeks delivery time The Tecnoseal 00485-1 is a zinc sacrificial collar anode designed for compatible Max Prop Saildrive propeller assemblies. Featuring a circular ring-shaped body with a split construction and lateral fastening arrangement, the anode measures 93 mm (3.66 in) in outside diameter, 63 mm (2.48 in) in internal diameter and 20 mm (0.79 in) in height. The manufacturer's drawing also specifies a fastening hole diameter (Ø2) of 5.5 mm (0.22 in). Weighing 0.42 kg (0.93 lbs), this zinc anode provides replaceable sacrificial galvanic corrosion protection for electrically connected underwater metallic components of compatible Max Prop Saildrive systems.
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$ 77.31
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1-2 weeks delivery time The Tecnoseal 00489 is a zinc sacrificial cone-shaped propeller anode designed for compatible Max Prop 2-blade propeller assemblies. Its tapered conical body features a recessed mounting section and fastening holes for attachment to the corresponding propeller component. The anode measures 51 mm (2.01 in) in overall height, 36 mm (1.42 in) in base diameter and 27 mm (1.06 in) in internal diameter, with an additional mounting dimension (a) of 9 mm (0.35 in) and a fastening hole diameter (Ø2) of 4.5 mm (0.18 in). Weighing 0.21 kg (0.46 lbs), this zinc anode provides replaceable sacrificial galvanic corrosion protection for electrically connected underwater metallic components of compatible Max Prop propeller systems.
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$ 98.98
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1-2 weeks delivery time Tecnoseal 01035 and 01035MG are sacrificial propeller nut anodes compatible with Varifold VF108 and VF120 3-blade and 4-blade folding propellers, corresponding to original Varifold part number VF3AN. Featuring a rounded, cylindrical nut-shaped body with a domed end and an internally threaded mounting cavity, both versions measure 52 mm (2.05 in) in height and 41 mm (1.61 in) in outside diameter, with an M16 × 2 thread specification. The zinc version 01035 weighs 0.36 kg (0.79 lbs), while the magnesium version 01035MG weighs 0.09 kg (0.20 lbs). These replaceable sacrificial anodes provide galvanic corrosion protection for electrically connected underwater metallic components of compatible Varifold folding propeller assemblies.
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$ 63.55
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1-2 weeks delivery time The Tecnoseal 01036 is a zinc sacrificial propeller ring anode designed for Varifold VF70 2-blade folding propellers with Saildrive installations, replacing original Varifold part VF2SDA. The anode features a circular split-ring body with lateral fastening points and a central opening for mounting around the corresponding propeller component. It measures 85 mm (3.35 in) in outside diameter, 67 mm (2.64 in) in internal diameter and 19 mm (0.75 in) in height, with a fastening hole diameter (Ø2) of 7 mm (0.28 in). Weighing 0.22 kg (0.49 lbs), the zinc anode provides replaceable sacrificial galvanic corrosion protection for electrically connected underwater metallic components of compatible Varifold Saildrive propeller assemblies.
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$ 75.80
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1-2 weeks delivery time Tecnoseal 01037 and 01038 are zinc sacrificial propeller nut anodes designed for Varifold VF160 and VF240 4-blade folding propellers. The 01037 replaces original Varifold part VF4AN and fits VF160 propellers with diameters from 26 to 32 inches, featuring a 67 mm outside diameter, 70 mm height, 9 mm axial opening and M16 thread. The larger 01038 replaces original part VF4AN(230)KIT and is specified for VF240 4-blade folding propellers over 32 inches, measuring 93 mm in outside diameter and 100 mm in height, with a 10 mm axial opening and M30×3.5 thread. Both feature a cylindrical body with a rounded, domed end and a central fastening arrangement. Manufactured from zinc, they weigh 1.20 kg and 3.76 kg respectively and provide sacrificial galvanic corrosion protection for compatible Varifold propeller assemblies.
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$ 147.85
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1-2 weeks delivery time Tecnoseal Variprop / Variprofile propeller nut anodes are available in zinc, aluminium and magnesium for compatible DF-80, DF-107, DF-112 and DF-128/140 propeller assemblies. Featuring a rounded conical body with a recessed circular mounting base and three fastening positions, these sacrificial anodes are offered in four sizes: DF-80 for 12–17 inch propellers (Ø67 × 38 mm), DF-107 for 15–20 inch propellers (Ø78 × 43 mm), DF-112 for 20–25 inch propellers (Ø90 × 55 mm) and DF-128/140 for 24–32 inch propellers (Ø105 × 56 mm). The corresponding mounting dimensions and weights vary by model and material. These replacement anodes provide sacrificial galvanic corrosion protection for electrically connected underwater metallic parts of compatible Variprop and Variprofile propeller systems.
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$ 135.20
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1-2 weeks delivery time Tecnoseal 01074, 01074AL and 01074MG are sacrificial propeller nut anodes designed for Variprofile VP64 propeller assemblies, with the manufacturer indicating a compatible propeller size range of 17–22 inches. Featuring a rounded, dome-shaped body with a recessed mounting base and central fastening arrangement, all three versions share an outside diameter of 55 mm (2.17 in), a height of 25 mm (0.98 in), a central diameter Ø1 of 6 mm (0.24 in) and a base diameter Ø2 of 50 mm (1.97 in). The zinc 01074 weighs 0.24 kg (0.53 lbs), the aluminium 01074AL weighs 0.09 kg (0.20 lbs), and the magnesium 01074MG weighs 0.06 kg (0.13 lbs). These replaceable anodes provide sacrificial galvanic corrosion protection for electrically connected underwater metallic components of compatible Variprofile propeller systems.
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$ 52.98
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By request Tecnoseal 01075, 01075AL and 01075MG are sacrificial propeller nut anodes designed for Variprofile VP76 propeller assemblies, with a manufacturer-listed compatible propeller size range of 20–26 inches. The anodes feature a rounded, dome-shaped body with a recessed circular mounting base and central fastening arrangement. All three versions measure 68 mm (2.68 in) in outside diameter and 29 mm (1.14 in) in height, with a central diameter (Ø1) of 6 mm (0.24 in) and a base diameter (Ø2) of 60 mm (2.36 in). The zinc 01075 weighs 0.39 kg (0.86 lbs), the aluminium 01075AL weighs 0.16 kg (0.35 lbs), and the magnesium 01075MG weighs 0.10 kg (0.22 lbs). These replaceable anodes provide sacrificial galvanic corrosion protection for electrically connected underwater metallic components of compatible Variprofile propeller systems.
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$ 59.50
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1-2 weeks delivery time Tecnoseal 00516H and 00518H are zinc hinged shaft anodes designed for sacrificial galvanic corrosion protection of marine propeller shafts and electrically connected underwater metallic components. Their two-piece hinged construction allows installation around the shaft, with a single securing screw and an included bolt and nut, as specified by the manufacturer. Both versions measure 112 mm (4.41 in) in outside diameter and 105 mm (4.13 in) in height. The 00516H fits a 57.1 mm (2¼ in) shaft and weighs 3.65 kg (8.05 lbs), while the 00518H fits a 63.5 mm (2½ in) shaft and weighs 3.20 kg (7.05 lbs). Manufactured from zinc, these replaceable shaft anodes are intended for corrosion protection in suitable marine environments.
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$ 205.93
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1-2 weeks delivery time The Tecnoseal 00602/6AL is a solid aluminium plain rod with a smooth, unthreaded cylindrical profile, measuring 20 mm (0.79 in) in diameter and 600 mm (23.62 in) in length. Listed in the Tecnoseal catalogue under Plain Rods (Barrotti Non Filettati), this aluminium rod provides a straightforward cylindrical format for applications requiring this material and dimensional specification. The rod weighs 0.51 kg (1.12 lbs) and is identified by manufacturer part number 00602/6AL. Its suitability for a particular installation should be checked against the required material, diameter and length.
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$ 53.39
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1-2 weeks delivery time The Tecnoseal 00621/1MG is a magnesium plain rod anode from the manufacturer's unthreaded rod range (Barrotti Non Filettati), designed for use as a sacrificial material in suitable galvanic corrosion protection systems. This solid cylindrical rod measures 145 mm (5.71 in) in diameter and 100 mm (3.94 in) in length, with a catalogue weight of 3.00 kg (6.61 lbs). Its plain, unthreaded construction provides a straightforward cylindrical form for installations requiring this material and dimensional specification. Magnesium is generally selected for freshwater corrosion protection applications, subject to the requirements of the specific installation.
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$ 297.69
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1-2 weeks delivery time GALVATEST galvanic current test kit for checking the operation of cathodic protection systems on harbour equipment and pleasure yachts, including sacrificial-anode and impressed-current systems. The kit also allows harmful leakage currents from the shore or quayside to be detected. It includes a professional Ag/AgCl reference electrode with a 7.5 m cable and banana-type connector, a suitable multimeter, a high-density PE carrying case and instructions for use.
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$ 749.60
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1-2 weeks delivery time ATOM TECNOSEAL is a panel-mounted electrochemical potential monitoring display for continuous supervision of cathodic protection conditions on submerged and semi-submerged metal appendages. The system supports from 1 to 6 measurement points and works with separately ordered zinc or silver/silver chloride probes. It features NMEA protocol support, a 4.3" high-brightness TFT LCD resistive touch screen with 480x272 resolution, 12/24V power supply, operating temperature from -20°C to +70°C and compact 118x78x32 mm dimensions.
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$ 1,508.80
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1-2 weeks delivery time Osculati 43.850.10 is a pure zinc electrochemical monitoring probe for the ATOM TECNOSEAL cathodic protection monitoring system. It is designed for continuous measurement of cathodic protection conditions on submerged and semi-submerged metal appendages and can be used as one of up to six monitoring points connected to the ATOM display. The zinc probe is the more economical probe option recommended in the catalogue for medium-sized boats, with the zinc sensing element typically requiring replacement every 2–3 years.
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$ 178.94
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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.