Rotary vacuum pump or, simply, rotary pumps, are dry vacuum pumps designed to meet chemical duty laboratory needs. They are ideal for rotary evaporators, concentrators, vacuum ovens, filtration, degassing and other chemical applications. The Welch DryFast and Ultra DryFast rotary vacuum pumps have built in vapor management controls for precise control when distilling organic solvents. This is a vital feature on most rotary pumps when handling aggressive vapors and gases. These rotary pumps require very little maintenance, leading to low cost of ownership and improved productivity.