In the decoration, is the water pipe PPR used 20mm 25mm or 32mm?

32mm pipes are generally used for household pipes; 25mm pipes are generally used for the main pipe under the household pipes, which can directly connect to various parts of the kitchen and bathroom; 20mm pipes are generally used for some branches, such as toilets. Water inlet pipe, etc. However, under normal circumstances, 20mm pipes are not used, and 25mm tap water pipes are used directly from the household pipe.