I have back to back bathrooms that are a mirrored image of each other. The main line will start beneath the bathrooms and be a horizontal line that I would like to keep in the floor joist space. I'm trying to figure out how to plumb the toilets. They are back to back. I'm thinking the first toilet would be a 4 x 3 closet bend into the main, then a 3 x 3 x 1.5 Wye with a 1.5" street 45 for the vent up the wall that divides the bathrooms. Should I use a 3 x 3 x 3 Wye with a street 45 to pick up the next toilet? How can I connect 4" toilet line? What about vent for this toilet? Could I do another 3 x 3 x 1.5 at a slight angle from horizontal over to the next joist space and then back to wall between bathrooms?
Thanks,
Tom
Thanks,
Tom