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The appearance size of the toilet has nothing to do with the pit spacing, the same toilet, the appearance size is different, and sometimes the hole spacing is different. The hole spacing is measured by the distance from the wall to the center of the drain, as shown in the figure below
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Toilet pit distance Toilet installation.
The measuring pit distance is 350mm, and you can't buy a toilet with a 400mm pit spacing because it can't be installed, but the measuring pit spacing is 400mm, and you can buy a toilet with a pit spacing of 350mm.
It can be installed, but the flushing effect will definitely be affected, and it is easy to clog, so I personally recommend replacing it with a toilet with a 300 pit distance!
It turns out that 300 pit spacing cannot be installed with 400 pit spacing toilets.
This pit spacing is a bit large, and it is also nice to leave a gap of two or three centimeters behind the toilet when installing.
The price of the toilet has no relationship with the size of the pit spacing, and the same brand and model of different pit spacing toilets are the same price.
The pit spacing is the distance between the center of the toilet drain and the wall.