What Size Pipe for Mobile Toilet Base Connection

The connection interface sizes for the drainage pipes at the base of mobile toilets mainly include two standard specifications: 110 millimeters and 100 millimeters. Here is a detailed explanation:

110-millimeter specification
This is the most common standard size in the sanitary ware market in mainland China, corresponding to 4 inches in the imperial system. Newly constructed buildings typically use this specification for their sewage drainage pipe systems, and the base interfaces of the vast majority of mobile toilets (toilet bowls) on the market are also designed according to this standard. Its advantages lie in its strong adaptability, which can meet the drainage needs in most scenarios. It has high compatibility with mainstream pipe systems, and the installation process is relatively simple. For example, in public places, commercial buildings, and newly built residential properties, the mobile toilet bases with 110-millimeter interfaces can be directly connected to the sewage drainage pipes without the need for additional conversion fittings.

100-millimeter specification
This size is more commonly found in older buildings or specific types of products. Some sewage drainage pipe systems built in the early stages may adopt the 100-millimeter specification, so some old-style mobile toilet bases are designed to match this size. In addition, certain mobile toilets for special purposes (such as temporary event toilets or customized products) may also use 100-millimeter interfaces due to space limitations or differences in drainage requirements. However, it should be noted that the adaptability range of the 100-millimeter interface is relatively narrow. If it is connected to an 110-millimeter pipe, a reducing coupling or other fittings are required for transition. Otherwise, it may lead to water leakage or poor drainage due to size mismatch.

Selection suggestions
In practical applications, if it is a new construction project or replacing a mobile toilet base, prioritize the 110-millimeter specification to ensure compatibility with the existing pipe system. If it involves the renovation of older buildings or special scenarios, first measure the size of the original pipe interface, then select a matching mobile toilet base or achieve size conversion through professional fittings. In addition, before installation, check whether the inner wall of the pipe is smooth and unobstructed, and ensure that the interface is well-sealed to avoid leakage problems during subsequent use.