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Finding the Right Toilet Size for a 390mm Outlet

08/02/2025 | Hawkrown

When renovating a new home, there’s an unavoidable issue: installing the toilet. How to choose the right material for the toilet, how to install it, and what is the proper pit distance for matching the size of the toilet?

What size toilet fits a pit distance of 390mm:

For a 300mm toilet, the term "pit distance" refers to the distance between the toilet's wastewater outlet pipe and the back wall of the toilet. Typically, the pit distances for bathrooms are 300mm or 400mm. It's essential to determine the pit distance first, as this will dictate the toilet you can purchase. When deciding on the pit distance, consider the thickness of the bathroom tiles; otherwise, the toilet may not install correctly.

How to choose the right toilet:

1、One-Piece Toilet: In a one-piece toilet, the tank is integrated with the toilet bowl. With just a gentle press of a button, water flows, making it easy to clean. One-piece toilets are easier to install but tend to be more expensive and are longer than two-piece models. They have better siphon action and lower noise levels, and they typically have a more attractive appearance.

2、Two-Piece Toilet: The tank and base are separate in a two-piece toilet, and installation requires bolts to connect the tank to the bowl. Two-piece toilets are generally more affordable, though installation can be more complex, and the tank might be prone to damage. Also referred to as "split" toilets, they have a stronger flushing action but are noisier. Unlike paper products, which can be tossed in the toilet, a trash can is usually placed next to two-piece toilets. Their strong flushing ability and efficient water flow are notable advantages.

3、While some toilets are called one-piece, they are essentially joined in the final process, with glazing applied by hand. A smooth side with no bumps indicates a true one-piece design, whereas bumps suggest a two-piece model.

4、The main styles of toilets available on the market include square, elongated, and U-shaped designs. It is crucial to try out the toilet in person to ensure it fits well, especially for taller individuals, to ensure comfort for both the hips and feet. Besides regular toilets, there are also smart toilets with automatic cleaning functionality available today.

In summary:this information provides insights into toilet installation and selection. For more related content, please continue to follow Hawkrown.

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