Atwood uses a zinc clad rolled aluminum tank.
Anode rods are not required with an aluminum clad tank
Suburban like residential WH Tanks are made using Steel tank...hence the NEED from an anode rod that are made of sacrificial material to protect the steel tank
Lots of aftermarket products available ....... that have one goal-----get your $$$$
Anode rods for Atwood, RV TP, Slideout supports etc
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Dodge 3500 w/Tractor Motor & NUWA 5vr
US NAVY---USS Decatur DDG-31