Leybold D40 D40B Trivac Rotary Vane Dual Stage Mechanical Vacuum Pump. The Leybold D40 D40B Trivac is a durable vacuum pump with a superior vapor handling capability. The Leybold D40B dual stage rotary vane mechanical vacuum pump offers an excellent ultimate pressure of 1x10-4 Torr. These pumps are commonly used for vacuum furnace evacuation, backing turbomolecular pumps, backing diffusion pumps, rotary evaporation, refrigeration system evacuation, epoxy degassing, vacuum sterilization, backing mass spectrometers, freeze drying, vacuum centrifugal applications, vacuum distillation, space research, and other vacuum processes. These Leybold D40 D40B vacuum pumps have a pumping speed displacement of 32.5 CFM. Part Number 91286-2