What is the function of a clamp for stopping a liquid in a chemical experiment?

What is the function of a clamp for stopping a liquid in a chemical experiment?

The experimental device is connected साथ में a rubber tube, which is designed to clamp the rubber tube so that the two devices do not communicate.

What is the function of a clamp for stopping a liquid in a chemical experiment?-MasterLi,चीन फैक्टरी,आपूर्तिकर्ता,निर्माता