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Looks like the main sewer line vent. Usually where the line exits the house to the sewer, septic, or cesspool.
I agree except that the OP says it's under the garage floor, which would mean that the waste line is running under a concrete slab before hitting the trap and vent. Which means no cleanout for at least what? 10 or 20 feet, depending on the size of the garage. That's nuts. Ideally there should be an accessible cleanout just before the trap. Good luck if that line ever broke, LOL, they'd be jackhammering up the garage floor. (Or running an entirely new waste line which might be a little cheaper but not "cheap". I had to have a new one run last year and it cost $2500.)
OP, do you have a basement? or crawl space?
The appearance of that exterior wall makes me wonder if this line was to the old original cesspool that was filled in when the house was connected to the sewer system.
OP, do you see another of those round vents anywhere else on the outside of your house? If so, where?
The size of that pipe is about 15 inches around (circumference).
Yes, there is a basement.
I'll check on whether there are other round vents anywhere else on the exterior of the house.
It doesnt matter if you're on sewers or cesspool, every house has a trap and vent where the line exits the house. Thats exactly what this is. In the hole is the access to the trap.
BBC- Drains are run under slabs all the time... 20' under concrete is nothing... These days, if a pipe fails, there are several relining options to keep it in service without having to jackhammer.
Thanks for all the advise. Sorry for the late response. Was taking care of some car repair (it got hit ).
"OP, do you see another of those round vents anywhere else on the outside of your house?" - Checked & didn't see any.
It doesnt matter if you're on sewers or cesspool, every house has a trap and vent where the line exits the house. Thats exactly what this is. In the hole is the access to the trap.
Thank you AJS Alex. Hope it's common/"normal" to have it in the garage?
Take it from a plumber who sees these daily. As others have said it’s the fresh air vent for your house trap. Pipe under concrete is perfectly normal and installed all the time. If it breaks (odds are in your favor it won’t) deal with it then. Sometimes it involves a jackhammer, sometimes one can get creative. Almost never can it be relined because the tees can’t be cut into the liner. I see tons of them in garages, crawlspace, basements above and below grade, outside. Nothing wrong with it being in the garage. It’s just where it worked out best for that houses application.
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