Which sanitary tee for kitchen sink plumbing?
I have seen both 2&quot; and 1-1/2 adapters at the drywall waiting to accept the white &quot;tubing&quot; (yup, that what plumbers call it, the thin white pipe used under the sink). From a practical standpoint, as to what readily available at your local hardware store, I would choose the 1-1/2 ABS sanitary T plus an adapter at the wall. You can also use the 2&quot; abs and adapt down to 1.5&quot; abs in two abs pieces, then get an abs straight piece then the 1.5&quot; abs to male threaded tubing adapter. The latter solution has more pieces and is therefore slightly costlier.
I'll let someone else pontificate on Code.