How to Choose Between 300mm and 400mm Rough-In Toilets for Your Home

There are various types of toilets on the market, with different rough-in dimensions such as 300mm and 400mm. So, what are the differences between a 300mm and a 400mm toilet? Let me introduce it to you.

Differences between 300mm and 400mm toilets

The main difference is the distance from the wall to the middle of the waste outlet. The terms 300mm and 400mm refer to the distance from the center of the toilet waste outlet to the wall, which is 300mm and 400mm respectively. When purchasing a toilet, it’s crucial to measure the rough-in distance of your bathroom first, and then choose a suitable toilet based on that measurement, as toilets with different rough-in dimensions cannot be interchanged.

How to choose a toilet for your bathroom

1、You should choose the appropriate type of toilet based on the actual conditions of your bathroom. First, understand the drainage method of your bathroom—whether it’s wall-mounted or floor-mounted. Also, consider the rough-in distance and the size of the pre-installation space for the toilet, as well as whether there are power outlets pre-reserved for the toilet. Based on this information, select a toilet that has the right size, rough-in dimension, and drainage method.

2、When purchasing a toilet, check its quality. For instance, you can remove the toilet seat and weigh it; a good product will generally be heavier. You can also flip the toilet over and check the number of waste outlets on the bottom. It is advisable to choose a toilet with a single waste outlet, as it usually offers better flushing performance. Additionally, examine whether the glaze on the inner wall of the waste outlet is smooth and even.

3、You can also pour blue dye into the tank of the toilet to check for leaks; if the colored water leaks out, that indicates a problem. Moreover, you can place paper into the toilet bowl and press the flush button to see if the paper gets flushed away, and notice any excessive noise during the flushing process.

In summary：this is a brief introduction to the differences between 300mm and 400mm toilets. I hope this article provides you with valuable information and assistance. For more related insights, feel free to continue following our updates.