Teflon® PTFE membrane, PP housing. A compact filter for venting and solvent filtration applications. Useful for maintaining purified water stored in carboys. The disposable carboy vent filter features a Teflon® PTFE membrane. The hydrophobic membrane permits sterile venting on a slow exhaust / liquid autoclave cycle of carboys up to 50 l. Can be used up to five times in venting applications. Non-sterile. Autoclavable.