Quartz immersion well, triple-walled, unjointed (plain) for use in our 6962,7863,7864,7865 & 7891 series reactor bodies. Designed for low temperature reactions cooled up to -78 degrees C. The outer two walls are permanently sealed and evacuated. The inner removable tube set consists of one each quartz, Vycor and borosilicate tubes. Code -50 complete unit includes the outer chamber, drilled neoprene stopper, SS/PTFE inlet assembly, one set of inner tubes and instructions.