I found that back in 2016, it is nothing, just a thread protector, that was removed during installation. Just toss it. What do you mean by heating element? Is it just gas, or gas and electric? If you mean an anode rod, Atwood doesn't require one, that is why there is none on the plastic drain plug, which is on the lower left corner.
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Bill 3rd
2016 Sunseeker 3010DS
2017 Ford Fiesta toad
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