The minimum trap size should be 1.25" for a bidet except where the tailpiece for a plumbing fixture is larger than indicated in the table; the trap shall be the same nominal size as the fixture tailpiece and not larger than the drainage pipe into which the trap discharges.
The minimum size of the trap and waste branch for a bidet is 2 diameter. It allows sufficient movement and space for adequate function, while not taking up too much space for itself. A bidet is a fancy addition to the toilet, which functions to wash your bottom without your hands being soiled.
It is a luxury addition to the bathroom and is often found in fancy restrooms of luxurious hotels. Popular across Europe, the bidet trend is also shifting into the eastern culture and making its appearance known. The luxury statement is a much desirable item by celebrities and the upper class.