According to user needs can be freely chosen, is not from the effects of corrosive substances such as acid, alkali solvents, and so on and also does not contaminate the laboratory. Novel appearance, easy to operate. The pump head directly immersed in water, minus the complicated water diversion devices. Bottom with brake caster, easy to move, the upper part with a detachable table cover, easy to add water, ice, or overhaul.