What is toilet rough-in? How long is it in most cases?

The rough-in of the underneath drainage toilet: the distance between the drainage center of the toilet and the surface of the mounting wall
The rough-in of the rear drainage toilet: the distance between the drainage center of the toilet and the surface of the mounting ground.
Generally, the rough-in of the underneath drainage toilet is 305mm or 400mm.

Generally, the rough-in of the rear drainage toilet is 100mm or 180mm.
 

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