Kamoer KVP8 Plus 12V 24V Micro Diaphragm Vacuum Pump With Brush or Brushlees Motor for Air TransferIntroduction:Small but powerfulNegative pressure (in series )<-0.09MpaNegative pressure( In parallel) <-0.07MpaDry running , durableand and maintenance freeBrush motor and brushless motor for selectionFlow rate≥660H/LAir positive pressure >0.1MpaChemical stability