North American Toilet Drain Pipe Diameter Standards and Installation Considerations

In North America, the standard diameter of a toilet's waste pipe is usually 3-4 inches (about 76-102 mm). This is because this size of drain pipe provides sufficient passage for the smooth flushing of solid waste and paper away from the toilet. 

Here are some things to keep in mind when installing a North American toilet: 
1.Measure accurately: before installing the toilet, you need to measure the location of the drain to ensure that the new toilet will properly align with it. It is also important to consider leaving enough space so that there is enough room to move around the toilet. 

2.Use the right seal: A wax seal or other type of seal is usually needed at the bottom of the toilet to prevent leaks. Make sure that the seal you choose blends in well with the toilet and the waste pipe. 

3.Check the water level: After installing the toilet, check that the water level in the toilet tank is appropriate, neither so high that it overflows nor so low that it flushes poorly. 

4.Ensure that the toilet is stable: the toilet should be installed on a flat and stable surface to prevent it from wobbling or shifting. 

5.Comply with local regulations: When installing a toilet, you need to comply with local building and sanitation regulations, and in some places you may need a professional to do the installation. 

6.Professional tools: Try to use professional tools for the installation, such as wrenches, levels, etc. These will ensure the accuracy of the installation. 
7.Safety first: in the operation process, to ensure safety, to avoid excessive force leading to toilet rupture or injury. 

8.Care and Maintenance: After installation, regular toilet care and maintenance will ensure the normal operation of the toilet and extend its service life. 

Each toilet may have its own specific installation requirements, so before installation, it is best to consult the product's instructions, if there is any doubt, you can contact the manufacturer or ask a professional to help installation.