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Zinc hull/rudder/flap anode Alloy: US MIL-A-1800 1 L – Zn Material: Zinc 99.5& pure Usage area: Hull, sea chest, flaps, rudder, etc. Zinc anodes protect the boat's metal parts against corrosion. For installation lengthwise below the boat's waterline and adjacent to the metal parts to be protected. An anode should be replaced when half of it has corroded away. Korrosionsgruppens zinc anodes contain more than 99.5% pure zinc. For best results when installing zinc anodes, the new anode should always be roughened up with a nylon brush and the attachments checked with an Ohmmeter. The must be no electrical resistance between the anode’s attachment and the part to be protected (e.g. engine or propeller). Korrosionsgruppens anodes are manufactured in compliance with U.S. MIL. 18001 H, standard for zinc anodes.