Installing new toilet in basement. The toilet essentially "lines up" with the waste stack, meaning that the toilet is not offset from the waste stack. The waste stack drains away from the new toilet location so imagine that you could essentially draw a line from the new toilet and down the sewer line so the waste stack would be on this line.

With this background, can I put a "tee" or a "wye" at the base of the sewer stack so that the stack will run up from one of the legs of this fitting and attach the new toilet to the other leg of this fitting? This would cause the toilet to attach to the sewer pipe at the base of the vent stack. I hope this makes sense.

The other option would be to drain the toilet at a 45 degree angle, run the drain "around" the base of the sewer stack and then attach it to the drain pipe using a "wye" once the drain is past the stack location.

Of course, there will be a "tee" on the toilet drain leg to provide for venting.

Thanks in advance for any feedback you can offer.

deleted



Edited 2 times.

how far below grade is the main stack horizontal pipe?
can't you leave the vertical stack and cut a 'y' into the horizontal pipe?
aim this pipe directly at the new toilet location, put a 3x2 'y' in it for a wet vent that the lav will drain into about 18 inches above the floor.

I see what you are saying. You're going to replace the 90 at the base of the stack with a combination and drain the toilet into the back of the wye. As long as you wet vent the toilet, with another wye between the toilet and stack, it'll work.

My apologies to "Pipe runner (AZ)" and "packy (MA)" for my unclear explanation but it appears that "North Carolina Plumber" was able to visualize my question. Yes, I was wanting to know if I could replace the 90 at the base of the stack and replace it with a combination just as described.

I didn't want to complicate my original question, but this is a new downstairs half-bathroom and this will be a new, second waste stack that I am installing to facilitate the reconfiguration of our first floor bathrooms during a house remodeling that I am performing. I just wanted to confirm that I could install the new waste stack and drain the new toilet into the back of the wye at the base as North Carolina Plumber described.

I took and passed the local homeowner's plumbing test and I am sure that I will be able to do this work correctly with your feedback on this question. Thanks to all of your help and interest.



Edited 1 times.