J Jamesplumbing06 Well-Known Member Joined Feb 24, 2016 Messages 552 Reaction score 112 Location , Aug 2, 2019 #1 Where is the code that allows a sanitary tee under a toilet? Tennessee. And before I get a bunch of nay sayers. We been using it like this for 30 years. Only under toilets and vents. But I know some where in the ipc book. It says this.