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This pump is also known as double stage water ring vacuum pump. High capacity at high vacuum and low quantity of water requirement, which saves energy. In the conventional Single stage vacuum pump the performance after 70% vacuum falls down drastically, whereas the Two stage vacuum pump gives better performance after 70% vacuum. Normally the vacuum pump requires running consistently between 70 to 90% vacuum. Two stage vacuum pump gives appx. 50% more Vol. efficiency with saving of 50% power. Some of the precautions are must while operating two stage water ring vacuum pump including turning the shaft by hand to ensure that pump runs freely. Additional info on Two Stage Vacuum Pumps, including about manufacturer and models, visit website at - http://www.ppipumps.com/products_tsvp_vws_series.htm