This inexpensive line of diaphragm vacuum pumps are designed by KNF to provide effective vacuum for a variety of filtration jobs including bottle top and manifold filtration, also vacuum degassing and solid phase extraction. Maintenance-free, there is no pump oil to change, nor is water or drain required for operation. Compact and portable, KNF uses only corrosion-resistant materials avoid damage from corrosive solvents. KNF's multi-port valves are highly resistant to damage from liquid condensate, and pass thru with no loss of performance.