I am installing a new lavatory in proximity to a toilet 2" vent pipe. Is it okay to tie the lavatory drain to the toilet vent pipe?

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Originally Posted by Liscarney

I am installing a new lavatory in close proximity to a toilet 2" vent pipe. Is it okay to tie the lavatory drain to the toilet vent pipe?

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If there's nothing connected to the 2" vent above where you're teeing off to pick up the lavatory the answer is, yes you may.
Cut in a 2X2X1 1/2" drainage tee 17 1/2" off the floor to center of the tees branch. You can arm off the tee and stub out 1 1/2" to the trap. Good luck. Tom