The Rheem AP11525L-3 Anode Rod is designed to protect your water heater from corrosion, featuring a diameter of 0.840 inches and a length of 19-3/8 inches. Made from magnesium, this anode rod effectively extends the lifespan of your water heater by preventing rust and degradation. It is compatible with various Rheem models, ensuring optimal performance and efficiency. The magnesium material provides superior protection compared to aluminum or zinc alternatives, making it a reliable choice for homeowners. Regular replacement of the anode rod is essential for maintaining the efficiency and longevity of your water heater.