My guess by the size and location a capped off drain pipe. How does the basement toilet flush? is it uphill to the outtake with a lift station someplace or are you on high ground in relation to the sewer or septic line?
If it is a drain line you would just need to tie into the hot and cold supply lines and run them to the sink location.
Hey
@bud16415, thank you for your insights!
We have sewer and it's in a pretty densely populated area. I'm not sure if we are on high ground in relation to the sewer -- any suggestions on how to determine this? Our basement is fairly shallow and I we are fairly high in terms of elevation, compared to other houses further down our block (we are on a gradual hill/incline).
I'm including a video showing a water line that goes to the toilet as well as some other pipes/water lines. Just outside the bathroom you can see how we have a washing machine and laundry sink. Curious to get your thoughts on if this helps paint the picture any clearer, and if you have any guess as to a ballpark estimate for how much it would cost to put a sink right in the bathroom itself. I would think that this would be an easy job since water lines seem very close to this bathroom, but am grateful for your thoughts/opinions.
Thank you again - really appreciate your time!