That black “tubing” is actually “pipe”, and the EMT tubing is incorrectly named “tubing” by engineers way smarter than me. 
Tubing= O.D.
Pipe = I.D.
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That black “tubing” is actually “pipe”, and the EMT tubing is incorrectly named “tubing” by engineers way smarter than me.
Tubing= O.D.
Pipe = I.D.