... 8,16,20,30,50,80 20L Cooling Water Circulating Pump Features:•Side in the wind side exhaust, corner round ... which make mixing more uniform and no dead Angle? Trough internal no disk tube design can make the slot experiment space ... and laser equipments: biological pharmacy 4.Scientific experiment equipments: molecular pump rotation evaporation meter, distillation, fermentation device, laser, metal 5. ...