Head scratching clog

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Unsprung

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I have had many clogs in my kitchen sink over the years. I am no plumber but this is the first one I can’t fix. I have double sinks with no garbage disposals. Water will not drain in either sink. I have tried plunging the daylights out of them, liquid plumber, baking soda and vinegar, a gallon of boiling water (9x), snaked then out to about 7 feet, and have checked the U-pipe under both sinks (which are clean as a whistle). I am at a loss. Why won’t the water go down?
 

Reach4

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Basement? Crawlspace?

Anyway, if you let the sink sit, I expect the water recedes, right?

If you let it sit overnight, how much water do you need to add before you can see some backup? Using that figure, you can approximate the volume of pipe that is upstream of the clog. That pipe length will help you predict where the clog is.

The clog often happens where the drain line transitions from vertical to horizontal.
 

Jeff H Young

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the clog is beyond the reach of snake or it didnt go down the drain it could have gone up the vent
 
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