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At the top of the picture, please see the 3" diameter pvc pipe. It seems to run inside the wall behind the toilet up to the ceiling then it makes a 90 degree turn and heads through the ceiling to some unknown destination.

What do you think it's for? Water? Gases?
Thanks

 

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waste stack, vent stack or radon vent? Prolly waste stack
 

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Just look in the attic to see if it does run up through the roof like it should.
 

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There could also be a hidden toilet in the attic. But odds are it is a vent.
 
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