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Originally Posted by Flacker
Is the hot water tank aluminum? If so be cautious using dissimilar metals, as it will corrode like crazy, and you will long for your old plastic plug.
If you can get an aluminum plug for the aluminum tank with a few wraps of teflon tape, that'd be the best.
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I was looking at that and I wasn't sure if it would be an issue. So far I haven't actually found an aluminum one, just plastic and brass.
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Atwood water heater tanks are constructed of a high strength aluminum. The interior of the tank consists of a .0015 thickness of type 7072 aluminum (pure aluminum and zinc) that is fused to the core during the rolling process. This material protects the tanks from the effects of heavy metals and salts found in waters throughout the country. It is anodic to these heavy metals and acts much like an anode in a steel glass lined tank except it will last much longer. Aftermarket Anode Rods are not required and should not be used and will void warranty.
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The pressure release valve is brass, so I think it would be ok?