Extend the life and efficiency of your RV's water heater with replaceable anode rods. Atwood Anode Rod is made of magnesium. Simply remove the plastic drain plug and insert the anode rod. When replacement is necessary, unscrew the old one and insert the new one. Anode Rods are easily replaced and should be checked every three months. .5" dia. 4-1/2" long. | Camco Anode Rod for Atwood Water Heaters