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 Plastimo 420060 zinc sacrificial anode for Vetus Series propeller applications. The anode has a diameter of Ø60 mm and weighs 0.440 kg. Its compact rounded propeller-anode design is intended for installation as part of the Vetus propulsion system.
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$ 27.89
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1-2 weeks delivery time Plastimo 421247 zinc sacrificial washer anode for Vetus Series applications. The anode weighs 1.17 kg and corresponds to OEM reference NC052. Its washer-shaped body is designed for installation within the Vetus system, while the zinc material is specified by Plastimo as compliant with MIL-A-18001K.
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$ 31.15
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1-2 weeks delivery time Plastimo zinc sacrificial anodes for J Prop propeller applications, available in two sizes. Plastimo 475663 measures Ø60 x H27 mm and corresponds to OEM reference OG042, while Plastimo 475664 measures Ø80 x H33 mm and corresponds to OEM reference OG041. The zinc material is specified by Plastimo as compliant with MIL-A-18001K.
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$ 27.82
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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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1-2 weeks delivery time Osculati 43.850.20 is a silver/silver chloride (Ag/AgCl) electrochemical monitoring probe for the ATOM TECNOSEAL cathodic protection monitoring system. Designed for continuous monitoring of cathodic protection conditions on submerged and semi-submerged metal appendages, it provides the premium long-life alternative to the pure zinc probe. The ATOM system supports from 1 to 6 measurement points and can be installed on vessels with hulls of any material.
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$ 1,096.92
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1-2 weeks delivery time 4bready electronic antifouling system uses ultrasonic waves to inhibit the growth of marine organisms such as cirripeds, mussels and barnacles. The 12 V microprocessor-controlled unit is supplied with two non-through-hull transducers installed on the inside of the hull, each providing approximately 6 m diameter coverage, making the supplied configuration suitable for vessels up to 12 m. Maximum consumption is 900 mA, standard cable length is 8 m, transducer voltage is 250–850 V peak-to-peak, power is 40/60 W and operating frequency is 18–42.80 kHz.
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$ 5,240.65
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1-2 weeks delivery time 4bready additional ultrasonic transducer for expanding the coverage of the 4bready electronic antifouling system. The transducer is secured to the inside of the hull without a through-hull installation and operates with ultrasonic signals generated by the system control unit. According to the catalogue, each transducer provides operating coverage of approximately 6 m in diameter, while the required number of transducers depends on vessel size.
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$ 618.75
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1-2 weeks delivery time 4bready extension cable for use with the 4bready ultrasonic antifouling system. The 10 m cable provides additional connection length between system components, allowing greater flexibility when positioning the ultrasonic transducers inside the hull. Designed specifically for 4bready system installations.
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$ 260.53
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1-2 weeks delivery time BPS Marine BPS-1 is a single-transducer ultrasonic antifouling system designed to protect hulls up to 20 ft long, as well as drives, rudders, stabilizers and other underwater components. The 12V DC system uses a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz with transducer output up to 60 W and an average power draw of 0.25 Ah. The kit includes one BPS-1 control module with integrated power cable, one submersible ultrasonic transducer with 15 ft of cable, epoxy kit and printed installation and operation manual.
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$ 740.89
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1-2 weeks delivery time BPS Marine BPS-2 is a two-transducer ultrasonic antifouling system designed to protect hulls up to 30 ft long, as well as drives, rudders, stabilizers and other underwater components. The 12V DC system operates with a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz, provides up to 60 W of transducer output and has an average power draw of 0.5 Ah. The kit includes one BPS-2 control module, two submersible ultrasonic transducers with 15 ft of cable each, an epoxy kit and a printed installation and operation manual.
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$ 1,469.77
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1-2 weeks delivery time BPS Marine BPS-4 is a four-transducer ultrasonic antifouling system designed to protect hulls up to 50 ft long, as well as drives, rudders, stabilizers and other underwater components. The 12V DC system uses a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz, provides up to 60 W of transducer output and has an average power draw of 1 Ah. The kit includes one BPS-4 control module, four submersible ultrasonic transducers with 15 ft of cable each, two additional 15 ft extension cables, an epoxy kit and a printed installation and operation manual.
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$ 2,941.55
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1-2 weeks delivery time BPS Marine BPS-6 is a six-transducer ultrasonic antifouling system designed to protect hulls up to 65 ft long, as well as drives, rudders, stabilizers and other underwater components. It is also suitable as a single-system solution for vessels under 52 ft with pods or stern drives. The 12V DC system uses a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz, provides up to 60 W of transducer output and has an average power draw of 1.5 Ah.
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$ 4,062.90
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1-2 weeks delivery time BPS Marine BPS-8 is an eight-transducer ultrasonic antifouling system designed to protect hulls up to 80 ft long, as well as drives, rudders, stabilizers and other underwater components. It is also intended as a single-system solution for vessels under 52 ft with inboards or sail drives. The 12V DC system uses a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz, provides up to 60 W of transducer output and has an average power draw of 2 Ah.
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$ 5,184.25
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1-2 weeks delivery time BPS Marine PRO-2, part number 24V-PRO-2, is a two-transducer ultrasonic antifouling system designed to protect hulls up to 40 ft long, as well as drives, rudders, stabilizers and other underwater components. The 24V DC system uses a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz, provides up to 120 W of transducer output and has an average power draw of 0.5 Ah. The package includes one PRO-2 control module, two submersible ultrasonic transducers with 15 ft of cable each, an epoxy kit and a printed installation and operation manual.
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$ 2,605.14
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1-2 weeks delivery time BPS Marine PRO-4 is a four-transducer ultrasonic antifouling system designed to protect hulls up to 60 ft long, as well as drives, rudders, stabilizers and other underwater components. The 24V DC system uses a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz, provides up to 120 W of transducer output and has an average power draw of 1 Ah. The package includes one PRO-4 control module, four submersible ultrasonic transducers with 15 ft of cable each, two additional 15 ft extension cables, an epoxy kit and a printed installation and operation manual.
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$ 4,062.90
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1-2 weeks delivery time BPS Marine PRO-6 is a six-transducer ultrasonic antifouling system designed to protect hulls up to 75 ft long, as well as drives, rudders, stabilizers and other underwater components. It is also intended as a single-system solution for vessels under 60 ft with pods or stern drives. The 24V DC system uses a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz, provides up to 120 W of transducer output and has an average power draw of 1.5 Ah.
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$ 5,004.03
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1-2 weeks delivery time BPS Marine PRO-8 is an eight-transducer ultrasonic antifouling system designed to protect hulls up to 90 ft long, as well as drives, rudders, stabilizers and other underwater components. It is also intended as a single-system solution for vessels under 60 ft with inboards or sail drives. The 24V DC system uses a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz, provides up to 120 W of transducer output and has an average power draw of 2 Ah.
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$ 6,165.44
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1-2 weeks delivery time BPS Marine PRO-16 is a sixteen-transducer ultrasonic antifouling system designed to protect hulls up to 150 ft long, as well as drives, rudders, stabilizers and other underwater components. It is also intended as a single-system solution for vessels under 120 ft with inboards or sail drives. The 24V DC system uses a multi-frequency ultrasonic sweep from 20 kHz to 42 kHz, provides up to 120 W of transducer output and has an average power draw of 2 Ah.
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$ 12,192.71
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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.