The Magnesium Anode Rod from RHEEM MFG COMPANY measures 0.840 inches in diameter and 50-3/16 inches long, designed to protect water heaters from corrosion. This anode rod is made from high-quality magnesium, which effectively extends the lifespan of your water heater by preventing rust and sediment buildup. Its precise dimensions ensure compatibility with various water heater models, making it an essential maintenance item. This anode rod meets industry standards for quality and performance, ensuring reliable protection for your heating system.