Currently in the process of stripping the body panels and rear tub to be sent out for media blasting and painting. This part was under the Lefthand Rear portion of the tub, just above the wheel well. It appears to be some sort of tank that has a single port. I have searched through the green book, parts manual, and all of the accessory parts manuals - but have not been able to identify this. Any ideas?

Thank you in advance -Click image for larger version. 

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