The Bradford White 415-49559-04 Aluminum Hex Head Anode Rod A420 is a replacement anode rod designed to help protect compatible Bradford White water heaters from corrosion. Installed inside the water heater tank, the aluminum anode rod works through a sacrificial process, attracting corrosive elements that would otherwise attack the tank lining. It is commonly used in residential and ... Bradford White 415-49559-04 Aluminum Hex Head Anode Rod