This is a CTI Cryo-Torr 7 or 100 Cryopump Helium Side Repair Kit. The CTI-Cryogenics Cryo-Torr 7 or 100 pumps, are one of the two major components that make up the Cryo-Torr Pumping System. The second component is the Compressor (also sold on this website). The Cryo-Torr CTI 7 or 100 Cryopump, provides fast, clean pumping of all gases in the 10-3 to 10-9 Torr range. Standard applications include, Semiconductor, Aerospace & Vacuum coating as well as R&D. The cryo-pump operates on the principle that gases can be condensed and held at extremely low vapor pressures, achieving high speeds and through puts. The Cryo-Torr 7 or 100 Pump is a highly-reliable and rugged unit that requires minimal servicing. Since the cryo-pump exposes no moving parts, operating fluids, or backing pumps to the vacuum, the possibility of system or process contamination from the cryo-pump itself is eliminated. Descripition, Installation, Regeneration, and Maintenance Procedures are totally covered in the Cryo Torr Pump Installation, Operation and Maintenace Instructions .pdf for download to the side.