In enhancement to elbows, carbon steel pipe fittings also consist of tees, which connect 3 sections of pipe, producing joints for fluid circulation. Equal tees are utilized when the attaching branches are of the same diameter, while reducing tees are employed when the branch pipe is of a smaller size. https://nerdgaming.science/wiki/Understanding_the_Different_Types_of_Pipe_Fittings_for_Seamless_Installations