|Posted by ED on June 11, 2003 at 18:23:37:|
I want to install at top of drain a 3" wye and below that a 3" combo. Down stream will be two lavarotories.
I want to vent off the top wye and reduce to 2".
My friend and part time plumber says that the vent is essentialy the soil stack and must remain 3".
He also says that I cannot lay a t on its back to drain the lavarotories into the sewer line.
I am confused can you help me.