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I measured it and it would come out under the cement where I approximately marked in red in the next picture. The main house sits on the other side of that cement walkway.

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My only guess is it has something to do with central vac that the house used to have but was ripped out for some reason (evidence in the basement). But why fill it in?

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  • My first two thoughts are water drainage (but why the pipe?) and conduit for power, air hose, or whatever. Have you tried fishing something through it or doing sound location testing? Have someone tap on it and listen outside. It might turn and go out to the yard. – isherwood Jun 11 '19 at 18:14
  • It's filled with something solid so nothing can be fished through it. Could not hear anything anywhere as the ground and cement isolate sound pretty well. – ACD Jun 11 '19 at 18:29
  • That's a knockout/test cap (for temporary debris protection). Is it also filled? – isherwood Jun 11 '19 at 18:51
  • I don't understand your comment. Is what also filled? The pictures are of the same pipe. – ACD Jun 11 '19 at 18:58
  • that path is too high, which is why your wall's rotting – Jasen Jun 11 '19 at 19:01
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Radon vent? Pop the cap off of it and see if it turns and goes under the slab.

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  • Looks like a layer of caulking inside the pipe. Bad way to cap a pipe. Curious to know if the pipe slopes to the house. Perhaps once that plug is out, pour some water in, that is if the basement is not finished of course. – user68386 Jun 11 '19 at 22:49
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    I have a radon system installed, it is definitely not part of that system. – ACD Jun 12 '19 at 12:33
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Looks like they put in pipe for future add on . For electric or some thing other to get beyond slab.

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  • Agreed. Could have been for the now abandoned central vacuum system, and if so, you would want it plugged against pest entry. – JRaef Jun 12 '19 at 1:08

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