Abstract: A fire sprinkler piping system fitting including a polymeric body having at least a first tubular branch, a second tubular branch, and a third tubular branch. Each of the first, second and third tubular branches extend outwardly from a common junction. The first and second tubular branches are collinear and the third tubular branch is generally perpendicular to the first and second tubular branches. Each of the first, second and third tubular branches have a distal end opposite from the common junction. The fitting includes pair of internally threaded metal inserts. Each insert is at least partially molded into the distal end of a separate one of a first and second tubular branches. Each of the internally threaded inserts has a distal outer surface facing generally away from the common junction. The distal outer surfaces of the pair of internal threaded metal inserts is spaced apart a distance of between three inches and four inches.