kenny b
“All in all, the question that i asked was not answered”
That’s because your question only makes sense to you, your lacking the correct terminology that defines your question. You’re making general statements that are just not true or correct.
Here is your original question:
“Does the vent on a drainage line (DWV in ground) HAVE to be the second last fixture?”
Applicable drainage lines of your question- building drain, horizontal branch of the building drain, horizontal branch, fixture branch or fixture drain. The latter contains a single fixture which only makes your question even more confusing.
I didn’t stop in to give you a hard time, and of course local codes prevail, but real plumbing actually has a common language. It’s just getting lost because it’s easier to dumb it down in today’s world than to learn the correct way.
