Reliable WOB-L Piston pumps are perfect for many common laboratory vacuum applications. Features: Vacuum and Pressure – to 100 Torr (26″Hg). Includes Vacuum and Pressure Regulators and Gauges – simple to adjust and monitor vacuum level and delivery pressure. Inlet Water Trap – float ball rises to seal off pump from accidental ingestion of water. Muffler quiets pump and filters discharge air. For use with dry or aqueous vapor applications only.