The Leybold TW250 S (TW-250-S) turbo molecular high vacuum pumps have a pumping speed of 230 liters per second (l/s). The Leybold TW250 S turbo molecular pump inlet is LF 100 with a ISO KF-16 exhaust foreline flange. The Leybold TW250 S turbomolecular pump can be used for all general-purpose and corrosive high vacuum applications. These Leybold TW250 S turbo pumps are excellent rebuilt high vacuum pumps and have been fully tested. But, if it ever does need servicing we here at Idea Vacuum Products have trained technicians to fix any problem. This pump comes with a full 90 day parts and labor warranty. For complete Specs see below (AVAILABLE DOWNLOADS) and download the operating instructions manual.