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 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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1-2 weeks delivery time BPS Marine 15' Signal Cable Extension is a shielded cable designed to carry the ultrasonic signal between a BPS Marine ultrasonic transducer and the control module. The 15 ft cable can be used either to connect a transducer to the controller or to extend an existing transducer signal cable.
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$ 51.85
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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.