The J2J2S Roots Water Ring Unit is a vacuum pump system composed of a ZJ-type Roots pump as the main pump and a two-stage water ring pump as the primary pump. It can not only remove general gases but also gases containing a small amount of moisture and dust. Compared to general mechanical pumps and general water ring pumps, it has the advantages of low oil pollution, low water vapor and fine dust, high ultimate vacuum, and high pumping speed at higher vacuums. It is an ideal vacuum pump equipment for drying, dehydration, and vacuum degassing in industries such as light industry, food, and chemical engineering.