Differences Between 400mm and 300mm Toilet Rough-In Measurements

When purchasing a toilet, it is essential to pay close attention to the toilet rough-in measurement, as this can affect the successful installation of the toilet. Let's take a look at the differences between a 400mm rough-in and a 300mm rough-in.

What is the difference between a 400mm and a 300mm rough-in？

The difference lies in the distance from the center of the toilet drain pipe to the wall. For the 400mm rough-in, the distance is 40 centimeters, while for the 300mm rough-in, the distance is 30 centimeters. When selecting a toilet, it is crucial to accurately measure the actual rough-in distance in your home. Different rough-in measurements require different types of toilets.

For instance, if the actual rough-in distance is 40 centimeters, but the user purchases a toilet designed for a 30-centimeter rough-in, there will be a 10-centimeter gap between the toilet and the wall. This misalignment will prevent the toilet waste outlet from aligning with the drainage pipe, leading to installation failure. Therefore, it is recommended that everyone measures their actual toilet rough-in distance before making a purchase.

What aspects should you pay attention to when purchasing a toilet？

1、Weight: When selecting a toilet, you should lift it to check its weight. A quality product usually tends to be heavier and is generally priced higher. In contrast, lower-quality products are often lighter and less expensive. It is advisable to choose a toilet based on your needs and budget.

2、Flushing ability: You should also assess the toilet's flushing ability. If a toilet has poor flushing performance, it is not recommended for purchase, as this could lead to clogging issues during use. Typically, it is best to choose a toilet with a larger waste outlet or opt for a vortex flushing model.

summary：This concludes the detailed explanation of the differences between a 400mm and a 300mm rough-in, as well as important considerations when purchasing a toilet. I hope this information is helpful for those in need. If you want to learn more related knowledge, feel free to continue following our platform.