at which point should i tap into the existing drain

Old 03-15-06, 04:00 PM
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Join Date: Apr 2002
Location: USA
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at which point should i tap into the existing drain

I'm installing a basement sink and need to pump the drain water into the city. below are two points I see fit to tap into my existing drain. One is right above the pump box (picture 1 ) and the other is right above the sink ( which is about 3 feet over from picture 1 ) The one above the sink seems to have more working room ( picture 2 ).

Should I just cut the pipe before or after the clean out? Angle the tee fitting at the same angle as the clean out? On the pipe pumping into the existing drain pipe do I have to put a check valve? The black pipe isnt anything special is it? I can just get schedule 40/80 white at the home store and be set?

Lastly to tap into water for the sink should I continue to use copper or get a union and use pvc?

Picture 1
Picture 2
Old 03-19-06, 11:42 AM
Join Date: Aug 2003
Location: KY/OH
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Stick with similar materials and use copper, install that drain before the cleanout with a check valve in line to prevent the reversal of flow.

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