Vacuum powered suction units are connected to the central vacuum system installation directly or with a connector on a flexible tube. The basic device includes a regulator button, manometer {from 0 to -0.7 bar}, shut-off valve, central system connector, outlet connectors, bacterial filter and as an optional equipment, a safety jar which prevents the liquid from entering the device. The manometer and the safety jar with the outlet connector can be rotated, so that the user can always place them in the most convenient position.