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You can find the answer in this link
https://codes.iccsafe.org/public/document/code/550/9793989
The minimum size of pipe is 1/2 inch for fixture outlet such as Laundry Sink, washbasin, shower per head
In most cases, the main pipeline from the street to your home is either 3/4 or 1 inchin diameter, supply branches use 3/4-inch-diameter pipe, and pipes for individual components are 1/2 inch.
According to international plumbing code the pipe shall be not less than.1 mm
In my field of study, we care about the flow of water, the volume of water, the quality of water, the methods of treatment of water, water, pressure and water behavior So I apologize for the answer
minimum 1/2" for sanitary fixtures.
The minimum of supply water in plumber is 20mm
as per requried ment minimum 3/4 inches
