Nov 16, 2021 · Whatman 6720-5002 50 mm In-Line Filters, PTFE, 0.2µm, 10/pk Filter Diameter (mm) 50. Connections 6-10mm Stepped Barb. Max Pressure (PSI) 60. Description 50 mm In-Line Filters, PTFE, 0.2µm, 10/pk. PTFE membrane filters are ideal for chemically aggressive solutions. Use as protective vents or for in-line filtration and isolation applications.