Body and cover made of 3.3 borosilicate glass. High chemical resistance. They are able to desiccate such as calcium chloride, silica gel, phosphorus pentoxide and even sulfuric acid. Users must clean the sealing surfaces and lubricate them with vacuum grease. It can maintain a 500mm Hg vacuum for 24 hours. Dimensions: Ø 200mm, height 270mm. Capacity approx. 2.5 l