ChinaChinaRotaryScrewAirCompressorSuppliers The advantage for screw air compressor with tank: 1. IE4 permanent magnet motor, with heacy duty inverter, saving energy over 20-30%; 2. Constant pressure and silence; 3. Small footprint, can be moved at any time; 4. Large size air end, low speed, sufficient air volume; 5. Six heavy-duty bearings, morse taper connection; website:http://www.hengchaowintechnology.com/rotary-screw-air-compressor/