The 4-45 bioreactor vessel is manufactured from type 1 class a Borosilicate glass. This vessel has 4 sidearms around 100mm center neck. The stainless steel capseal has 5 ports for insertion of 12mm probes and 1/4? tubes. The vessel has an internal impeller assembly with stainless steel ball bearings and ptfe paddle. Sidearms positioned 90 degrees for increased capabilities.