We must replace a 70-year-old toilet. In order to choose a toilet we are
told that we need to know the rough-in. What is this? On plumbing supply
web sites, such as kohler.com and americanstandard.com, there is mention of
12-inch rough-in. How do we determine our rough-in? And can we buy a
toilet without knowing that? Thank you. -Jeff Linder )