Patented magnesium anode rod for aluminum water heaters (Atwood style) preseRVes the life of your water heater by corroding itself so your water heater tank doesn't. Replace your 1/2" pipe thread drain plug with Camco RV Water Heater Anode Rod to extend the life of your RV's water heater. Internal drain valve allows you to drain your water heater without tools and sealer.