The Rheem Water Heater SP11309L Anode Rod is a corrosion-protection component designed for compatible Rheem water heaters. Installed inside the storage tank, it attracts corrosive elements in the water, allowing the anode rod to deteriorate instead of the tank lining. Commonly used in residential and commercial hot water systems, it helps protect the tank from rust and premature corro... https://www.partshnc.com/rheem-water-heater-sp11309l-anode-rod