Yep, Atwood has an aluminum tank. Also, always replace the plastic plug with anther plastic plug, don't use a metal one or it may fuse itself to the Aluminum tank (electrolysis at play).
If you reuse the plastic plug clean out the inside of the plug, sediment collects there. I always carry a couple spare plugs.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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