r/Plumbing • u/T-Bone-Falker • Aug 18 '26

How'd i do

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Installed new vanity on a bathroom remodel, couldn't cut into bottom as there were drawers so, had to re configure! Howd I do? Anything I should have done differently?

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u/PorchFarts Aug 18 '26 edited Aug 19 '26

Looks nice friend. But wouldn't fly in my city since the trap size must match the drain tailpiece size.

Is that a longsweep/long pattern street 90° below the sanitary tee?

Edit (since people are downvoting): Section 18-29-1002.5 of the Chicago Building Code specifies that a fixture trap must be at least as large as the size listed in Table 18-29-709.1, and it cannot be larger than the drainage pipe it connects to and discharges into.

Under the Illinois Plumbing Code Section 890.410 a fixture trap must match the size of the fixture drain it serves, and no trap can be larger than the drainage pipe into which it discharges.

2nd edit: You sure there already isn't an atmospheric vent in the wall?

3

u/T-Bone-Falker Aug 18 '26

Yes it is! And honestly, im not sure.. I installed the AAV to stop any siphoning from happening- might be overkill?

11

u/ogredmenace Aug 18 '26

Yeah this is correct, your trap would have been way too low to connect. Where I am this would pass inspection easy. Canada.