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wetthumbs View Drop Down
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Direct Link To This Post Topic: sanitary tee or combo - attn: PLUMBILL
    Posted: 17-Mar-2004 at 6:17am
When merging a vertical drain line with a horizontial drain line: Can I use a sanitary tee laid on its back or do I need to use a combination fitting ("combo tee")?
This is in wisconsin, in a residential single fam. house. I tried to look it up in the plubing code book, but ohh man, thats some long reading! PS - I can not find a combo tee for sale at any hardware store.
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Retired plbg View Drop Down
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Direct Link To This Post Posted: 17-Mar-2004 at 1:46pm
You cannot use a Tee on its back are any horizontal position, You need a combo. are y& 45. It might not be in code but a Plumber should know that, are you a Plumber. Go to a Plumbing supplyhouse and buy the fittings. They dont have them in stores because they can make more money by selling y& 45.

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DUNBAR View Drop Down
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Direct Link To This Post Posted: 17-Mar-2004 at 5:38pm
I agree. No tee shall be laid on its back.

You can lay a tee on its side, but the degree of angle shall be no less than 45 degree of direction.


And from that tee, no turn of direction more than a 45 degree turn. That would be considered flat-venting if venting is its dedicated purpose.

» This message has been edited by DUNBAR on 18 March 2004

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Retired plbg View Drop Down
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Direct Link To This Post Posted: 18-Mar-2004 at 2:27am
He is talking about using a tee at base of stack what i get out of it, you can use tee on back for vent but not for waste.

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wetthumbs View Drop Down
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Direct Link To This Post Posted: 18-Mar-2004 at 10:09am
This is what I'm talking about
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John Aldrich View Drop Down
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Direct Link To This Post Posted: 18-Mar-2004 at 11:21am
Wetthumbs, Great Sketch!!!

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DUNBAR View Drop Down
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Direct Link To This Post Posted: 18-Mar-2004 at 1:12pm
What is going into the top/front of the tee? The front of that tee would have to be a drain for another fixture, otherwise, that would be a flat vent.

I am probably throwing confusion into this now.

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» This message has been edited by DUNBAR on 18 March 2004

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Retired plbg View Drop Down
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Direct Link To This Post Posted: 18-Mar-2004 at 2:12pm
You cant use a tee on a stack like that you need a combo. are a y & 45. What else do you want to hear.

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Direct Link To This Post Posted: 19-Mar-2004 at 6:01am
Dunbar I updated the image in my previous post to make things more clear. The "front" of the tee would be a cleanout. The AAV is also noted. What to you think of this plan?
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Direct Link To This Post Posted: 19-Mar-2004 at 9:05am
A cleanout is fine, just follow what Retired Plbg said by using a wye and a street 45 to make your turn of direction towards the main line.


A tee is too short of a sweep with the top of tee not being used for anything other than a cleanout.

With the combination T-Wye, the flow of fluids and waste will not build up at the cleanout as much as a tee would.

The suggestion of the T-WYE is for smooth operation of travel of waste.


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» This message has been edited by DUNBAR on 19 March 2004

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Retired plbg View Drop Down
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Direct Link To This Post Posted: 22-Mar-2004 at 1:59pm
How did you get the drawing on the post let me know.

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turdchaser View Drop Down
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Direct Link To This Post Posted: 22-Mar-2004 at 5:43pm
for godsake man don't teach the retired one!
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wetthumbs View Drop Down
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Direct Link To This Post Posted: 25-Mar-2004 at 5:36am
Its not real easy to do. It took me quite a while to learn how. To much info for me to explain here. Use your windows help menus, it might help.
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Direct Link To This Post Posted: 25-Mar-2004 at 5:52am
Just got back from vacation and saw your posting.

That part of the code is Comm.82.39 (8) found on page 28 of the Jan. 2004 edition of the Wisconsin Plumbing Code.

All the other plumbers are correct and you can fined the needed combo at any plumbing shop, supply house, or big box store, many hardware stores don't stock them you have to buy a "Y" and "45" to make one.

» This message has been edited by PLUMBILL on 25 March 2004

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Direct Link To This Post Posted: 25-Mar-2004 at 5:38pm
The sketch is pretty clear and shows the fitting as being part of the wet drain and not just a part of the dry vent system. Thus, you cannot use a sanitary or vent tee. You must use a combo type fitting. Period, end of story.
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