Acro 50 Vent Filter with Emflon II Membrane Disposable 50mm filters for air gas and vent applications. Hydrophobic PVDF Emflon II 0.2um membrane. Inlet/outlet stepped hose connections: 6.4 to 12.7mm stepped hose barbs with slip luer ID in hose barb. Wont crimp tubing. Filtration area: 20cm2.