So nutshell, GC that did my remodel years ago installed a double fixture fitting horizontal and capped the top. Line was used to drain side by side toilets. Well it clogged about 6 inches down the turn and no matter what could not be cleared. This was in a slab so you can imagine the cost of the fix. Before i head off to the law library to research to get all my ducks in a row, does anyone know the correct section or the actual code number that says its not allowed? Any guidance would be greatly appreciated.