Installed in the tubing line, immediately before the vacuum source, 50 mm filter device prevents fluid/aerosol contamination of and costly damage to vacuum pumps or particulate aspiration suction systems, while eliminating hazardous exhaust. Hose barbs for 1/4" to 3/8" ID. Filtration area: 16 cm². Pressure Rating: 0.9 bar (14psi) max. 10 per package. (Whatman 6722-5000)