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Depends what you consider skilled. I'm NO master plumber, but I've done about 25 bathrooms over the past 10 years or so. I've just never had to work with CI that much except for a lead toilet bend...

So here is my problem. As you can see from the photos, my existing stack is cast iron. I need to tie a new 4" branch into from a new bathroom.

My problem is that the new branch is lower than the...

So here is my new layout idea. Main branch 3". Each fixture on its own branch attaching to main with WYE. Added WYE COMBOs rolled to 45 on each branch to pickup the vents

Does this look better?...

So you would move the vent WYE from upstream of the trap and place it between the trap arm and the main WYE. COuld I come off the main WYE with a 45 bend, then the vent WYE rolled to 45 then the...

I saw this diagram in a book and it was confusing. Not only did it vent using Santees, is vented 90 degrees then up.

So getting back to my layout. I tested rolling the WYES for venting, and they...

I adding a new master bath to my first floor. I've attached photos of my pipe layout. Can you please comment on them. I attached two versions. One usings WYE's for venting and the othe using...