Plumbing line styles are based on information such as the size, type, and gauge of the material (i.e., Schedule 40 Carbon Steel or Copper Tube). Plumbing fitting styles are based on information such as type (i.e., tee, cross, trap, or check valve) and subtype (i.e., 45-degree mitered, 90 degree long-radiused, or 3-way). The style determines the appearance and function of the plumbing fitting.