Tee - one of the plumbing fittings
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
Basic knowledge - pipe
A pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow ? liquids and gases (fluids), slurries, powders and masses of small solids. It can also be used for structural applications; hollow pipe is far stiffer per unit weight than solid members.
In common usage the words pipe and tube are usually interchangeable, but in industry and engineering, the terms are uniquely defined. Depending on the applicable standard to which it is manufactured, pipe is generally specified by a nominal diameter with a constant outside diameter (OD) and a schedule that defines the thickness. Tube is most often specified by the OD and wall thickness, but may be specified by any two of OD, inside diameter (ID), and wall thickness. Pipe is generally manufactured to one of several international and national industrial standards.1 While similar standards exist for specific industry application tubing, tube is often made to custom sizes and a broader range of diameters and tolerances. Many industrial and government standards exist for the production of pipe and tubing. The term "tube" is also commonly applied to non-cylindrical sections, i.e., square or rectangular tubing. In general, "pipe" is the more common term in most of the world, whereas "tube" is more widely used in the United States.
Źródło: https://en.wikipedia.org/wiki/Pipe_(fluid_conveyance)
Are all failures require a visit to a plumber?
Hydraulics are often enough and require emergency repairs carried out by good professionals. Some failures are very serious, others less problematic, but each time should be conducted very fairly and professionally. These smaller faults often we will be able to fix yourself, but if you've become something more serious, you should call a good service hydraulics. Not every failure will end up pretty large costs or cause difficulties, but if not repaired properly, things can get complicated. 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.