A simple and economical device for demonstrating the effect of atmospheric pressure. One of them has a plastic stopcock for pumping out air and releasing vacuum and a rubber O-ring seal inside. One of them has a plastic stopcock for pumping out air and releasing vacuum and a rubber O-ring seal inside. The lightweight plastic construction makes them easy to handle and convenient to use. Can be connected to any suitable vacuum pump for evacuation.

Specifications:

• Diameters: 100 mm