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Old 04-15-2011, 06:26 PM   #1
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Ooops, I may have blown it


Hi all

I'll try to get this right.

I've added onto the existing septic drain because of adding an additional bathroom. The end of the new 'drain', which is the absolute end of the entire system, is where the toilet dumps into. Picture this... 'Updrain' from the 3" toilet sand Y is a reducer 3" X 2" that becomes the new vertical 2" vent.

The question is, can I do this? That is, connect the vent pipe a couple of feet updrain from the toilet sand Y and accomplish the venting I need for the toilet and the shower? I should add... the shower 2" drain connects to the 3" main drain a couple of feet down from the toilet 'sand Y'.

The other question is, should I have used a Y instead of sand Y?

Is that clear? Thanks to all that respond. Al


Last edited by Alvis; 04-15-2011 at 07:55 PM.
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Old 04-15-2011, 06:42 PM   #2
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Ooops, I may have blown it


Can you post us a photo?

It'd sure make it easier.....

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Old 04-15-2011, 07:41 PM   #3
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Ooops, I may have blown it


Hey Danger, thanks. The pic shows the toilet drain on the right, the stuff to the left of it is the vent.
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Old 04-15-2011, 07:44 PM   #4
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Ooops, I may have blown it


That's the most incomprehensible post I've seen in a while. What in the world is a "sand Y?" Where I live, the size of the septic system depends on the number of bathrooms. If that's the case where you are, adding a bathroom may not be such a good idea.
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Old 04-15-2011, 07:54 PM   #5
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Ooops, I may have blown it


MD... I believe a sand Y is not a T, not a Y, but rather a 'sand Y', ... so I was told by a plumber I know. The pic might better show what I was trying to say. Lol, sorry for the confusion. Our septic is capable of another bathroom.

Last edited by Alvis; 04-15-2011 at 07:56 PM.
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Old 04-15-2011, 07:58 PM   #6
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Ooops, I may have blown it


I believe he means a sanitary tee or a wye.

I understood it... and that's rare for me!

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Old 04-15-2011, 08:06 PM   #7
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Ooops, I may have blown it


OH... duh....

I think 2" is undersized for venting, but I could be wrong. Mine is similar, but I had to use 3" through the roof to vent.

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Old 04-15-2011, 08:25 PM   #8
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Ooops, I may have blown it


Danger... there are two vents in the 'entire' system. The vent in question is for the new toilet and shower. The other 3" vent is located about 14' down the drain... so to speak
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Old 04-15-2011, 08:33 PM   #9
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Ooops, I may have blown it


If it's permitted and going to be inspected, I don't think it'll pass.

This is not to say it will not work.

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