AWD offers a two-stage construction for peak performance at low suction pressures Atlas Copco liquid ring pumps are ideal for pumping either dry or wet gasses, with a high tolerance to liquid carryover, especially on condensable processes. Pumps are available in a variety of materials which can be selected to suit the pumped process media. All AWD liquid ring pumps are available as part of standard pre-configured modules manufactured according to Atlas Copco design principles for easy installation, use and service. AWD two stage liquid ring vacuum pumps are created for extreme reliability and are ideal for continuous general industry vacuum service below 200 mbara, particularly vacuum