1. Environmental, convenience and safe to use 2. High vacuum, high ventilation rate speed 3. Equipped with gas ballast valve, can suck a little water vapor, have function of mandatory inlet of oil 4. Continuous working for 3000 to 4000 hours in free of trouble. Application: The pumps can be widely used in foodstuff, scientific research, chemicals, medicine, electronics, universities and colleges, etc. Characteristics Description: 1.The mounting of the gas ballast valve allow the pump to pump certain amount of water vapor. 2.Easy to restart because of the mounting of a oil anti-suckback device. 3.2XZ-C is Mandatory inter oil vaccum pump. Carton sealed packaging.