CIRCOR International, Inc., a leading manufacturer and marketer of differentiated technology products and sub-systems, announces its IMO 3-screw positive displacement rotary pump technology, ideal for lowering transformer oil purification operating costs. The IMO 3-screw design excels under low/vacuum inlet pressures and provides enhanced reliability and longevity. The pumps are available in the 3D and 3E series for transfer/circulation of transformer insulating oil.