Type Rs-0.3 and Rs-0.5 rotary vacuum pumps are both directly connected minipumps with outer covers of aluminum alloy as the electical machinery.They are efficient in heat dissipation and can maintain a good performance for a long time and their quality is very good.The pumps are advanced in stable functioning and low noise, and are applicable to all kinds of vacuum evacuations in vacuum freezing,automobile reparation, medicine,mechanism,vacuum packing and so on.