The design of the outlet pipe of the toilet bowl. It determines, in particular, the features of its installation. To date, there are such options:
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Horizontal. In such toilets, the outlet pipe is located at the back of the bowl and is oriented horizontally backwards. This is one of the most common types in Europe and the post-Soviet space - it is due to the fact that sewer pipes in these countries are drawn along the floors, and the pipe in the bathroom is usually located under the wall, behind the toilet.
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Oblique. In fact - a kind of horizontal release (see above), in which the outlet pipe is not strictly horizontal, but at an angle (usually 30° or 45°). It will be useful in the case that the sewer pipe is low, near the floor.
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Vertical. As the name suggests, in these toilets the output is directed vertically down. They are mainly used in the United States and other American countries, where in the construction of communications, e.g. sewerage, conducted under the floor (ceiling) without taking into account the partitions - as a result, the toilet can be placed directly above the pipe. This layout is also found in the post-Soviet space, in particular in office and production premises, as well as in residential buildings on individual projects.
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Universal. The universal release design allows it
...to be connected to one of the three above options, depending on the specific need. Most often, the output of such toilets is hidden inside, and its own nozzle is absent; for connection selected separate pipe of the desired shape, it can go vertically, horizontally or at an angle.
It should be noted that it is theoretically possible to install a toilet with horizontal release in the bathroom under the vertical, and vice versa - but in practice, this is very difficult and actually requires the reconstruction of the toilet. And therefore, before choosing a toilet, you must clarify the design of sewer pipes in your bathroom and the most suitable type of outlet.