These anodes are ideal for protecting boat propeller shafts and rudder shafts from electrolytic corrosion.
Zinc shaft anodes are suitable for use in salt waters, but can also be used in brackish waters.
All cathodic protection systems must be inspected annually and the sacrificial anodes renewed if more than 50% are wasted. You should check the working surface of the sacrificial anode to ensure that it is free of paint and chalky corrosion deposits. When fitting or replacing a sacrificial anode you should also replace the serrated fan disc washers under the nuts and change the anode backing sheet on wood and GRP hulls. Exposed fixing studs, nuts and washers should be well greased or painted after assembly.
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