Use of combo fitting

AKantler · Jan 28, 2010

Hi guys/gals,

Another quick question....is it okay to use a combo for our bathroom lav 2" to go into the vertical 4" stack. I see most folks use a santee when entering the vertical stack. We've already dry fit ours with a combo....is that okay?

Thanks in advance!

JohnjH2o1 · Jan 28, 2010

No, use a santee. By using a combo your making a full S trap because the vent will be below the seal of the trap. That is also the reason why there are limits to the length of the waste arm because the pitch of the pipe would also put the vent below the trap seal.

John

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NHmaster · Jan 28, 2010

What JohnJ said x 2

AKantler · Jan 28, 2010

So this won't work...

Export! · Jan 28, 2010

Is that leftmost vent tied in too low?

AKantler · Jan 28, 2010

I don't know....? Does it have to be higher than the highest fixture? Or just 6" greater than the flood line of the fixture it's venting?

Export! · Jan 28, 2010

As I understand it, 6" higher than the flood rim of anything else vented through that run.

Dlarrivee · Jan 28, 2010

Are you talking about strictly venting? Which fitting are you talking about?

AKantler · Jan 28, 2010

I'm talking about the 4" to 2" fitting that is draining the sink into the main stack.

Dcelite · Jan 29, 2010

You can use a combo there because you have vented the lavy on the horizontal.

Terry · Jan 29, 2010

6" greater than the flood line of the fixture it's venting?

Yes, if it's venting the shower pan, you're okay.

Since you have a vent on the lav line, it doesn't matter if you use a santee or a combo on the stack.
It's not being vented there.
If you had trap armed from the stack, it would need to be a santee.

I would still check with your inspector there in Anchorage and see if he allows santees on their back for venting.
Here in Seattle, we now need to use combo's or wye fittings.

AKantler · Jan 29, 2010

Terry...I did call the city plumbing inspector, and he did say they use combos rather than T's on their back...

Thanks guys for all the advice!

Use of combo fitting

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