Adding drain line to sewage basin, can I use the vent?

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Longwood

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I have a basement pit with a sewage ejector that serves a basement bath. I want to add a wet bar to the basement and the best method I have for plumbing it is to use an undercounter type basin and pump to pump the grey water to the pit where it will then be pumped by the sewage ejector. The question is how to add the line to the pit.

The pit has 2 inch waste and vent lines. the new line is 1 1/2 inch. My thought was to t into the vent line a few inches above the sump, thus the last 8 inches or so of the vent would be a wet vent. The only other option would be to drill a new hole in the lid and I am concerned as to how make that seal.

Thoughts are appreciated.
 

Prashster

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I have done both methods to the satisfaction of my inspector. You will still have to vent the sink or greywater pump, though, no?

You can purchase a gasket to seal the 1 1/2 line if you choose to go thru the lid.

IMHO, if you can, position your sink closer to the pit, so you can eliminate the gw pump to the ejector.
 

Longwood

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Correct, I still have to vent the grey water line. That is actually the easy part with my conditions.

The Wet bar is on the opposite end of the house from the existing pit so no way to get there unless I break up 40 feet of concrete.
 
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