Elbow: Pipe fitting (long and short radius) for changing the direction of the pipe.
Long radius elbow: Bend radius equal to 1.5 times the nominal diameter of the pipe elbow.
Short radius elbow: Elbow whose bend radius is equal to the nominal diameter of the pipe.
Tee: A T-shaped pipe fitting that connects three pipes in different directions.
Reducing pipe joint: straight pipe fittings with different diameters at both ends