Medela D-Flex Aspirator. Stand not included. The Dominant Flex provides increased performance and faster suctioning by simply touching the 60 l/min flow change button, which activates the turbo mode for rapid vacuum build-up. The noise level can also be reduced by touching the 40l/min flow change button. Swiss engineering and manufacturing processes make the Dominant Flex a reliable and long-lasting piece of technology. The Dominant Flex has been thoroughly tested for compatibility with Medela fluid collection systems. 5-year warranty.