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Old 10-17-2011, 11:26 PM   #1
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plumbing a basement sink


Bought a pump box for under the utility sink with 1/3 rd HP pump, but it requires a vent pipe. How can I tell which pipe overhead is a vent that I can tap into?

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Old 10-18-2011, 12:12 AM   #2
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If you can post a pic, we'll try to help you figure it out.

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Old 10-18-2011, 11:01 AM   #3
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If you can post a pic, we'll try to help you figure it out.

I'll work on that tonight thanks..

BUT in the meantime, I THINK I found a vent, but not 100% sure. The floor above is a toilet, and can find the drain line for it, Y'd to it is a smaller pipe (maybe 2") that is Y'd in the opposite direction of the drain, and goes up into the wall. It's attached downstream from the toilet about a foot - 18 inches..and from there it's probably 8 feet until it attaches to the main drain. I'm assuming a toilet drain would require a vent.

The only issue I have it if it's a vent it's Y'd level and parrallel to the drain pipe..

But I will try to get pictures..

Thanks again!
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Old 10-18-2011, 01:26 PM   #4
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Just use an air admittance valve instead.
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Old 10-18-2011, 09:17 PM   #5
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Picture is of the toilet on the floor above and what I guess is the vent line for it?

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the other attachment is where the same toilet drain connects to the main going out of the house.
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Old 10-18-2011, 10:26 PM   #6
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I'm sorry to say that none of that is usable for the pump venting. I also do not recommend an AAV or Studor on the pump- wrong application.
The vent for the pump must connect 6" above the toilet or other fixtures on the main floor. If you connect to the toilet vent in the ceiling you will probably back drain to the pump when you flush, not to mention it violates most or all plumbing codes.
Do you have a floor drain or other plumbing in the basement?
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Old 10-19-2011, 10:29 AM   #7
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I'm sorry to say that none of that is usable for the pump venting. I also do not recommend an AAV or Studor on the pump- wrong application.
The vent for the pump must connect 6" above the toilet or other fixtures on the main floor. If you connect to the toilet vent in the ceiling you will probably back drain to the pump when you flush, not to mention it violates most or all plumbing codes.
Do you have a floor drain or other plumbing in the basement?
Agree completely, and actually here we MUST go out through the roof separately with our pump vents.
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Old 10-19-2011, 10:01 PM   #8
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question does your plumbing code allow for automatic venting in this case...????if so would be easy install and fix...
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Old 10-19-2011, 10:23 PM   #9
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question does your plumbing code allow for automatic venting in this case...????if so would be easy install and fix...
I really doubt that any jurisdictions would allow that on a pump.


Maybe in mexico. . .
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Old 10-20-2011, 12:26 AM   #10
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question does your plumbing code allow for automatic venting in this case...????if so would be easy install and fix...
As grey water is pumped from a basin, it needs to draw in air to replace the water. The opposite is true also- as water enters the tank, air needs to escape. An auto vent is not designed for that purpose. It doesn't work, I've tried it.
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Old 10-20-2011, 10:02 AM   #11
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It doesn't work, I've tried it.
I lol'ed.


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