Reduced Tee, also known as a reducing elbow. One type of piping fitting used to connect pipes of different diameters. It is further categorized into concentric and eccentric reducing elbows. See Piping Fittings.

Pipe materials include stainless steel reducers, alloy steel, carbon steel reducers with different diameters, as well as reducers in 20# steel grades such as Q234 and Q345.