Anodes are essential to the oil and gas industry for controlling the corrosion faced by submerged structures. High-grade zinc anodes are most effective in saltwater, a critical need for the petrochemical industry, while high-quality aluminum anodes are preferred for fresh and brackish waters, but are also effective in saltwater. Many production vessels such as heater treaters, storage tanks, pressure vessels, heat exchangers, skimmers, and oil-separation vessels, rely on treater anodes in zinc or aluminum, which are cylindrical, easy to replace, and suitable for challenging conditions (e.g. produced brines with elevated temperatures). The wide-ranging needs of this industry require experienced and precise selection of these parts.