When it comes to their function, it is the same, and they are used to close the water outlet in the basin bowl. However, they differ in the method of operation. An automatic plug is equipped with a band which is in the mixer body and requires mechanical operation – pulling and pushing in order to close/open the water outlet. And click-clack plug does not have a direct connection with the mixer. It is closed/opened by pushing it with a hand in the basin bowl.