Soft and Thorough Milking, High Milk Output, Ensuring the Quality of Fresh Milk. Economy, Health and Convenient Maintenance. Must Use the Specialized Lubricating Oil for Vacuum Pump.This Pump Should Be Equipped with a Motor, so You Should Prepare It by Yourself. This Pump Forbid Reverse Turn. 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.