Nov 01, 2021 · Cole-Parmer PTFE Syringe Filters, Non-Sterile; 0.22 µm, 50 mm. Filters are Triton-free and have a bidirectional membrane support and luer lock (15/25 mm dia) or stepped barbs (50 mm dia) inlet/outlet for a secure fit to the syringe. Membrane type and pore size are printed on each filter for easy identification.