Running 1st floor toilet into second floor drain

No tees on back can receive any drainage. You need to vent that toilet some how? Is the three by 2 tee on its back the lav for the bath room?
I would suggest you install a 3 by 1.5 inch wye run to the lav and use an AAV vent if approved by your local plumbing authority on the lav above the p trap picking up the drain.

No tees on back can receive any drainage. You need to vent that toilet some how? Can a wye 3" recieve drainage? or can I turn the tee off its back 45 to receive it?

Is the three by 2 tee on its back the lav for the bath room? If you are talking the ABS, yes it was... I am taking out all the ABS... Also, I am separating the grey water to it's own system.

I would suggest you install a 3 by 1.5 inch wye run to the lav and use an AAV vent if approved by your local plumbing authority on the lav above the p trap picking up the drain.grey water system

A Tee cannot be on it's back and used for drainage regardless of the angle.
You still need to vent the toilet...

TheEplumber said:

A Tee cannot be on it's back and used for drainage regardless of the angle.
You still need to vent the toilet...

Click to expand...

Can a wye 3" recieve drainage?

SpudMuffin said:

Can a wye 3" recieve drainage?

Click to expand...

Yes it can

ok, if I were to put a wye into the horizontal drain coming from the upstairs... My toilet of the first floor is 4' from that line. If I were to come out of the flange with a 90, have 4 foot of horizontal then go down with another 90 into a 3' piece angled into THAT wye on it's back... would that work?

Nevermind... I just changed my mind and am going to create a second vertical vent and run everything into that.