[costgeek]

I have a dry vent that is going to be connected after my shower. The remaining bathroom fixtures are downstream so this intersection is the beginning of a wet vent. The vanity also has a dry vent that connects between the two sinks.

The old plumbing (before I tore it out) used a sanitary tee on its back for this purpose. Since I was informed (on this forum) that sanitary tees should only be used in the vertical position, I wondered if my old plumbing was done incorrectly. So I read a bunch of forums and found this subject is hotly debated.

Anyhoo, I prefer to play it safe and not use a sanitary tee on its back...so is the one pictured below appropriate for this purpose (horizontal drain pipe with a vertical dry vent)?

 

[TheEplumber]

If it is used for venting, above the flood rim of the fixtures served, you can use a San tee upside down, right side up, or bullheaded. Makes no difference.
The tee you show is for pressure piping

 

[costgeek]

This tee won't be above the flood rim. What should I use? I don't think I have room for a combination wye.

 

[TheEplumber]

You must be 6" above the flood rim to join 2 vents together....

 

[costgeek]

This isn't two vents. It is one vent connecting to a waste line after the shower, but before the tub.

 

[TheEplumber]

I just read what you have in parenthesis in your first post .
A vent rising from a horizontal drain is done using a combo only. No tees there because it is in a horizontal drain

 

[costgeek]

I was afraid you were going to say that.

 

[carpdad]

Eplumber, when you say "combo", do you mean a wye and 45 deg street? And that combination is for better washing the pipe inside or less chance of clog? Thanks.
Also is there a book that illustrates and explains the practice whys? Most shelf books shows how but not why. The code books are worse. Example, I read 2-3 by Dan Holohan who explains why, just because his narrations were interesting.

 

[Ghostmaker]

That Tee is a pressure pipe tee. Purchase a DWV tee.

If your under IPC Code and the tee is downstream from the shower and upstream of the tub you are installing a circuit vent.

Virginia is an IPC state so a combo wye 45 is not required as long as the vent going up is dry and vertical.

Eplumber is used to UPC the west coast code. They have weird water and it doesn't act like our east coast water.

 

[TheEplumber]

We actually do use tees on their back in rare instances- but it is at the inspectors discretion. Most here view it as a tee on it's back in a drain line and not acceptable......

Eplumber is used to UPC the west coast code. They have weird water and it doesn't act like our east coast water.

Been a while since you've seen clean, pure water huh?

 

[costgeek]

Well that's a relief. This connection is in a very tight spot....

Thanks!