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New construction plumbing problem

Jeff Remas

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Double combination or double wye would work fine- I hope the vanity is about four feet high. In real life I probably wouldn't make them change out a double sanitary tee.

How would one fire-stop that cavity if it was a closet?

The double wye would force the connection to the vent to below the weir of the trap. A double T "combo" would have been the best choice.

If they used a wye then they would have to take the vent connection off the top of the horizontal drain and run it up and over to the stack

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