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TonyFugginMontana OP t1_iy9cc0v wrote

From my brief googling of the difference, I think you are right that it is a sanitary tee, not a wye.

I took another photo from a different angle:

https://i.imgur.com/UKixPEl.jpg

I suspect that the disposal was added after the fact, which would explain a lot of this. I guess I could knock out the plug and put the drain into the disposal and just cut and cap that whole drain from the air gap. I haven't decided but I'd probably go with the path of least resistance since this has been working.

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dominus_aranearum t1_iy9duvy wrote

That would be my guess as well. I probably wouldn't mess with it if it's working, just know that if there's a block, that's a good place to look.

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