Details. PTFE Vent Filter, Sterile, 0.2 Micron, 50mm, 6 to 12 mm hose BARB, 10/Pk. Sterile venting of filling vessels, including culture vessels and CO2incubators. Venting of holding tanks for sterile, distilled water and liquid culture media. In-line sterilization and particulate removal from air and gases.