A tee is the most common pipe fitting.It is available with all female thread sockets, all solvent weld sockets, or with opposed solvent weld sockets and a side outlet with female threads.It is used to either combine or split a fluid flow.It is a type of pipe fitting which is T-shaped having two outlets, at 90° to the connection to the main line.It is a short piece of pipe with a lateral outlet. A tee is used for connecting pipes of different diameters or for changing the direction of pipe runs.
They are made of various materials and available in various sizes and finishes.
They are extensively used in pipeline networks to transport two-phase fluid mixtures.They are categorized as: Equal Unequal When the size of the branch is same as header pipes, equal tee is used and when the branch size is less than that of header size, reduced tee will be used. Most common are tees with the same inlet and outlet sizes. Some of the industrial tees are Straight Tee, Reducing Tee, Double Branch Tee, Double Branch Reducing Tee, Conical Tee, Double Branch Conical Tee, Bullhead Tee, Conical Reducing Tee, Double Branch Conical Reducing Tee, Tangential Tee, and Double Branch Tangential Tee. The above tees are categorized on the basis of their shapes and structure. They can also be classified on the basis of the application they are required to perform. The three outlet sizes should be named in order (e.g.
left, middle, right; measuring 15-22-15).The three sizes of a tee are end x end x center, so a tee that is 1" on both ends and 3/4" in the center it would be 1" x 1" x 3/4".Źródło: https://en.wikipedia.org/wiki/Piping_and_plumbing_fitting
So it is better to rely here on the knowledge of experienced plumbers, than to rely on luck, because they often can we make this more difficult..