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A owner mod is what makes the most sense, but I don’t know why one would have one there (back corner - end of unit).
Prior owners had done some odd changes to the unit, but this particular plug does not look like the prior owner’s work.
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-Trevor
2008 Cooper Canyon 252FWRLS
2022 Sierra Denali HD 3500,
Crew Cab, Standard Box, 4x4,
6.6L Duramax Turbo-Diesel V8
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