The standard dimension diagram of toilet drain size refers to the standard of the size and shape of toilet drain. The standard sizes of toilet drains are usually 305mm and 400mm, and there are corresponding standards for front row water and rear drainage.
The lower outlet of the front drainage toilet is usually 305mm in diameter, which is suitable for drainage pipes with a diameter of 3 10mm or 3 15 mm, and the lower outlet of the rear drainage toilet is usually 355mm or 450mm, which is suitable for drainage pipes with a diameter of 3 10mm or 315 mm. ..
When choosing a toilet, you need to pay attention to whether the size of the drain is in line with the diameter of your own drain pipe to ensure smooth drainage. At the same time, we should also pay attention to avoid water leakage caused by installation errors.