Stainless steel or duralumin could be used to make the vessel 4. It is also possible to use galvanized steel sheet. The pipes are copper or brass as is the rotor 10 with nozzles. The casing – vessel 8 is made of duralumin or galvanized steel sheet. It is also possible to use PVC. The Z1 to Z5 transmission could be made of the materials given for the similar reducers described in Fig. 1, 3, etc.