The flow-meter™ suction trolley units allow to perform suction interventions in a rational and effective manner, as they include in one suction system all the necessary devices for a broad range of surgical and medical procedures, providing the operators with the most suitable solution of use in a hospital environment. This suction unit system allows to connect to the terminal units fitted on the trolley head one or two EASYVAC® vacuum regulators, preferably completed with the relative EASYSAFE® safety jar.