Rheem UV11524C Magnesium Anode Rod with 44-3/16-Inch Length and 0.84-Inch Diameter For best results, use only Rheem replacement parts for repairing your Rheem Water Heater Anodic Material: Magnesium, Total Length (in.): 44-3/16, Rod Diameter (in.): 0.840 Hex Head Size (in.): 1-1/16, Thread Size - NPT (in.): 3/4, Resistored: No