Anode Rods as pictured on the top of this page are used on Suburban RV Water Heaters to Extend the life of the water heater by attracting corrosive elements in the water that could corrode the water heater tank.
The Anode Rod is part of the Suburban Water Heater's drain plug. It should be checked at least once a year and should be replaced when half of the rod has been corroded away.
If you wait to change the rod until it is totally corroded you stand a chance of corrosive damage to the tank. Also excess sediment from the Anode Rod can cause flow problems with your RV's fresh water system.
Take a look at the video below tells you how to replace the Anode Rod.
As the video states when you are replacing the Anode Rod it is also a good time to flush your RV's Water Heater to get rid of any Sediment etc.
I hope this information helps.
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