Used 720 CFM Busch Dry Screw Vacuum Pump, Model #ACO400 COBRA, with MD 96-401 Blower/Lobe-type Vacuum Booster, NEMA 4X-X Auto-Purge. 20 HP Explosion Proof Variable Speed Inverter Duty Motor. Serial #RC2438-2, 25 HP, 230/460 V, 3 ph, 3535 rpm. Built 1997.