The metal on an anode rod plug WILL DAMAGE your Atwood water tank opening. Two different metals etc. DO NOT USE AN ANODE ROD. Buy a replacement plastic plug and replace once a year or two. Screw it into the water heater with finger pressure only or if it is leaking just turn with wrench very little, just enough to stop the leak. Use teflon tape on the threads, that helps it not leak with finger pressure only. This is advice for Atwood water heater only, Suburban water heaters do use anode rods and should but not Atwood!