AL Sewer Projects Practice Questions - Alabama Sewer Projects Contractor Examination Exam

In a standard precast sanitary manhole, what is the purpose of grade (adjustment) rings in the chimney?

To form the flow channel in the base To fine-tune final rim elevation to match finished grade To replace the need for a cone section To increase the diameter of the barrel

Correct Answer:

To fine-tune final rim elevation to match finished grade

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