The Eastman rigid aluminum anode rod helps prolong the life of your water heater tank by attracting corrosion to itself. The rod corrodes through electrolysis, a process that protects the steel walls of the water heater by attracting corrosion to a more noble metal. The anode rod is built with aluminum and zinc alloy. It is easy to install by attaching it to the top of the tank to keep it steady. The anode rod should be inspected periodically and replaced every 4 to 5-years. Anode rods are Lead-Free compliant for safe water drinking.