Jennings Anodes offers a range of hull anodes in various types, including circular, rectangular, square, disc, pear and teardrop shapes. These hull anodes are designed to flush mount against the hulls of ships, dams or tanks via built in steel straps. On the basis of substrate material, our hull anodes can be classified into three alloys: aluminum, zinc and magnesium. Aluminum anodes are suitable for use in saltwater or brackish/estuarine water. Zinc anodes are ideal for use in saltwater. Magnesium anodes are preferred to protect vessels operating in fresh water only.