The DESOI Double Rotary Head features a particularly high degree of tightness. In case of beginning leakage, the seals are re-tightened easily and quickly from the outside. If necessary, the seal seats can be re-lubricated from the outside as well. Both of which considerably reduce downtimes during work. Further characteristics of the DESOI DRH are the hardened wear bushings at the rotor as well as the hardened running surfaces for the shaft seal. Special designs are feasible.