Extend the life of your RV's water heater with the Camco RV Magnesium Anode Rod 0.5". This magnesium rod attracts corrosive elements in the water to protect the tank and elements from galvanic corrosion. It is compatible with Atwod heaters. DESIGN Extends life of water heater Attracts corrosive elements to protect tank Magnesium anode rod Dimensions: 0.5" diameter x 4.5" length Fits Atwood water heaters Additional Details Style: 11553C