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Dry-Type Vacuum Pump Set Roots +Screw Pump Limit Vacuum 0.1PA. By combining two different types of vacuum pumps, a higher degree of vacuum and a faster pumping speed can be achieved. Due to special technology, this series of vacuum pumps cause no pollution to the environment. It has an efficiency 1.8 times higher than that of the water ring vacuum pump, with low operating costs and can recover the investment within one year.