Specification: Material: cast iron Voltage: 110V Head: 20 meters Outlet diameter: 50mm Ultimate pressure: 100 (pa) Flow rate: 30 (m3/h) Suction rate: 250 L / min Maximum speed: 1440 rev / min Pump shaft position: horizontal Note: This pump needs to be used by its own motor. Vacuum Pump For Cow Milking Machine Milker Bucket Tank Barrel 110V 250 L/M US. Suction rate: 250 L / min. Maximum speed: 1440 rev / min.Note: This pump needs to be used by its own motor. 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.