Nozzle element of mass transfer apparatus contains an outer shell made in the form of a straight round cylinder with two open bases and a removable inner shell placed in it with the formation of a gap with it, with means of fixation on the inner surface of the outer shell. The inner shell is elastic. The means of its fixation on the inner surface of the outer shell are made in the form of radial threaded rods located in the threaded holes of the inner shell.