Magdeburg Hemisphere, Great Demonstration Of Air Pressure And Vacuums, Each

Details:

Two rugged plastic hemispheres are about 4.75 In. (12Cm) in diameterhas o-ring seal and an exhaust valveexhaust valve fits 0.25 In. Diameter (0.635Cm) pressure tubingmay be exhausted with water aspirator, hand pump or mechanical vacuum pum