Quartz immersion well, triple-walled, 60/40 inner joint for use in our 7841 and 7844 series photochemical 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 and borosilicate tubes. Codes -08 and -14 outer chambers include a drilled neoprene stopper and a SS/PTFE inlet tube assembly. Complete units, codes -42 and -45 include the outer chamber, one set of inner tubes and instructions.