What Diameter Should Your Toilet Drain Pipe Be？

What diameter is used for the toilet drainage pipe? How to repair a leaking toilet drain pipe? As a novice in toilet installation, you may not be very familiar with this. But don’t worry, I will provide a brief introduction below.

What is the diameter of the toilet drainage pipe：

The diameter is 110 millimeters. When determining the diameter of the drainage pipe, it's essential to consider the sewage discharge, inlet fitting, and whether the drainage pipe is of the same size. If the diameter of the toilet's drainage pipe is 110 millimeters, the connected drainage pipe must also be 110 millimeters. It’s crucial not to use a diameter that is too large or too small, as this can lead to installation issues or blockages.

Currently, the drainage pipes are primarily made from UPVC material, which has advantages such as resistance to acids and bases, corrosion resistance, good pressure resistance, high strength, cost-effectiveness, and low fluid resistance. In addition, UPVC has a lifespan and corrosion resistance that cannot be matched by cast iron pipes. During construction, it is also lightweight, easy to transport and process, and easy to connect.

How to fix a leaking toilet drainage pipe：

Toilet drainage pipes can leak for several reasons: the first is that the seal cap's hemispherical part might be too light. The second is that the drainage valve inside the toilet may not be installed securely. The third is that the drainage pipe may not be installed tightly or could be damaged.

If the leak is caused by the lightness of the hemispherical part, it may not seal tightly when it drops due to insufficient gravity after the water tank drains. Typically, it requires several attempts to seal it properly. A simple solution is to tie some weights, like nuts, onto the rod that connects to the rubber cap to resolve the issue.

If the leak is due to the inlet and outlet valve not being installed securely, the solution is to turn off the water supply switch and empty the toilet. Then, reinstall or replace the drainage valve, ensuring that it is sealed tightly.

In summary：after reading the above introduction, I believe you now have a better understanding of the diameter of the toilet drainage pipe. For more related information, please continue to follow our website, where we will present more exciting content in the future.