In the plumbing section for toilets at HomeDepot, I often see fittings to transition from 4" to 3" diameter drain pipe for toilets. Is 3" diameter acceptable size for toilet drains?
I'm remodeling and must replace most of my bathroom plumbing down to the main drain. Should I consider reinstalling by using 3" PVC? (I currently have 4" dia. cast iron).
Thanks,
-Theodore