Between the channel of the essiccamento air and the opening of rotary income of the small basket it must be mounted an estate that ermetizzi the adduction of the air, which held must compensate large tolerances of fabrication. At the same time the estate must assume automatically, to the action of the assembly, its ermetizzante position. To the scope the estate to ring consists substantially in a labbro elastic oriented, seen in section, in radial sense. Its contiguous surface to the wall of bottom of the small basket, oriented axially, door a woven covering of. (Figure 2).