hydrophilic 0.2 um ptfe filter for laboratory vacuum filter system 50mm 0.22um Hydrophobic PTFE air Vent Filter for Vacuum Pump Omicron 200050R PTFE Venting Filter Disc, 60 psi Maximum Operation Pressure, 50 mm, 0.2 µm Sterile, Individually Packed (Pack of 10) 5.0 out of 5 stars 4 2 offers from $76.85