For cell culture applications and glass autoclavable fermentors for microbial culture applications. The systems are built according to the specific demands of a process using an extensive array of standard components. Because of the modularity and flexibility, the user can always adapt the systems to changed process demands. This results in low initial investment and low running costs. The stirred tank reactor (STR) is the most widely used bioreactor type. Glass autoclavable bioreactors and fermentors are available in jacketed and single wall versions in 2, 3, 5, 7, 15 and 20 liter total volume (20 liter only in single wall version).