The 93560 SuperEvac is a Highly Efficient, 2 Stage Rotary Vane, Oil-Sealed Vacuum Pump that is Field Rated to 15 microns or Better. Features and Benefits Include an Internal Intake Check Valve to Help Prevent Oil Backup during Power Failures, Heavy Duty Rotors and Bearings, Built-in Vacuum Gauge and a Wide Mouth Oil Reservoir for Easier, Cleaner Filling. The Reservoir Doubles as a Pump Exhaust- Threaded to attach a Garden Hose for Exhausting to a Remote Location