NEW 550W Oilless Diaphragm Vacuum Pump Industrial Oil Free Piston Vacuum Pump. This Product Is a High Quality Oil-free Micro, Safe and Oil-free, Beautiful Appearance, Compact Structure, High Efficiency and Energy Saving, Long Service Life, Low Noise, Low Vibration and Low Temperature Rise. Vacuum Flow: 67l/Min (2.4cfm). Thank you for your support!Feedback is very important to us. It is impossible to address issues if we do not know about them! Faction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it's non-workdays, please kindly be patient and wait till Monday.