Oil free Vacuum Pump, Exclusive Oilless construction of Piston or diaphragm never requires lubrication, Continuously rated with built-in rugged motor-either Single phase or three phase, Most versatile, compact vacuum pump, permanently lubricated ball bearings, practically maintenance free, Portable light weight diecast aluminium components keep overall weight minimal, low noise level, balanced eccentrics provide smooth, low vibration operation, Built in micro air filter.