Here's a couple of pictures. In the left picture, the main stack is shown going up through the attic. The horizontal portion is the waste from a toilet that comes down from about four feet to the right. This is shown in the second picture. The 1-1/2" pipe to the right (barely in view) is a vent from the basement that vents a laundry tub and washing machine and, possibly, a future floor drain. This ties into the stack a few feet above this picture.
The 1-1/2" pipe to the left is a shower drain that ties into the waste line and goes down to the basement.
I need to tee a vent into the stack in the first picture. There is about 8" there but I cant pull the vent down or push up because of the existing fittings.
My plumber wants to cut the horizontal waste line to the left and right and put a couple of flex connectors there but that sounds like waste could get hung up there.
My thought was to cut the shower line to the left, and the 45 coming down from the toilet (shown in the second pic) and pull the line down enough to get a fitting in. Then ABS couplings to fix the shower and toilet. I can't use the existing vent from the basement because I'm adding 4 fixtures down there and need a separate vent line.
Long winded but I tried to cover everything.
Thanks,