Understanding Vent Plumbing

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the loop is for free flow of air. i personally disagree with this method

i think it is over kill, not needed

my theory is the foot vent is not needed, just the loop vent
Thanks:
Could that have been used here, if the loop was as high as the overflow behind the tub?
 
I dont know, the code calls it a "special venting for island fixtures"

If I wanted to use it, I would make a call first, ask the question,

before installing.
 

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