How to turn off the water in the hotel bathtub?

There is a circular metal switch in the bathtub, which usually opens to the right and closes to the left.

Bathtub is a water pipe device for bathing or showering, which is usually installed in the family bathroom. Modern bathtubs are mostly made of acrylic or fiberglass, and some are made of steel wrapped with ceramics. In recent years, wooden bathtubs have gradually become popular in Chinese mainland.