Abstract: A gas-lift device having upper and lower adapting members formed with throughgoing axial bores for the incorporation of the device in a well string, the adapting members being joined by a sleeve containing a profiled member, having an axial throughgoing bore, locked therein in juxtaposition with a profiled ring threaded onto the upper adapting member, the ring having an inner diameter less than that of the axial bore of the upper adapting member, so that an inwardly extending annular ledge is formed by the ring and an annular slot is defined between the annular ledge and the juxtaposed profiled member, the combination of annular ledge, annular slot and profiled member forming an upwardly directed turbulence nozzle, supplied with pressurized gas from a chamber formed in the sleeve.