How Toilet Pipe Dimensions Affect Plumbing Efficiency

The toilet installation must consider the pipe size beforehand; otherwise, the installation may not proceed smoothly. Here’s a brief introduction to the dimensions of toilet pipes.

What are the dimensions of the toilet pipes？

The standard dimensions are 30 cm, 35 cm, 40 cm, and 45 cm. The diameter of the drainage pipe that connects to the toilet is typically about 11 cm. The size of the toilet drain outlet is approximately 5 to 6 cm, while the S-bend pipe is also about 5 to 6 cm. When selecting a toilet, ensure that it matches the size of the sewer pipe to prevent installation issues later on.

Can the toilet pipe be rerouted？

1、The toilet pipe can be rerouted, but it's essential to communicate with the downstairs neighbors first. You can modify the original toilet pipe directly from below; this method is suitable and can effectively prevent blockages, but it must be done with the consent of the downstairs neighbors.

2、If you need to change the toilet pipe, you can raise the bathroom floor. The extent to which you raise the floor should depend on the toilet's drainage requirements. For instance, if the room's height is sufficient, this method could be considered. However, this approach might lead to potential blockages, so it's best to consider future modifications carefully.

3、If you wish to relocate the toilet, make sure to use a toilet relocation device for assistance. However, the maximum limit for this relocation device is 15 cm, which presents certain limitations. Additionally, there's a higher possibility of blockages occurring later on.

In summary：the relevant content regarding the dimensions of toilet pipes has been introduced. The standard dimensions are 30 cm, 35 cm, 40 cm, and 45 cm, and the diameter of the pipe connecting to the toilet is typically 11 cm. When choosing a toilet, ensure it conforms to the sewer pipe size to avoid installation issues later.