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sc10990 OP t1_iw0ujlg wrote

The big pipe is, what I perceive to be, the vent. It goes to a mesh vent on the outside of my house.

Oh you meant the other end, in the slab. Not sure, but it is right above the main sewer line and cleanouts, so I still suspect it to be the sewer vent.

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Atlantatwinguy t1_iw0v5qa wrote

What is on the other side of the wall?

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sc10990 OP t1_iw0vaqq wrote

That is an exterior wall. That pipe vents outside of my house, about 5 inches above ground level.

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