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I've never seen a cleanout under a lavatory sink but now I have to put one in on a bathroom addition. It's a 2" waste and vent (needed to boost total area of VTR) that has a big change of direction before tying into the main drain.
So I gather the cleanout t sits just above the trap san t. It seems like it's gonna be pretty cramped in there if anyone ever needs to use that cleanout. I'm not even sure it will have the requisite 12" clearance. Do I aim it a bit to the side? Should the waste san t be set lower down? Does your area allow trap sani-tee to be used as a cleanout? Any other tips?