wheel filter PTFE 0.2 micron filter China wheel filter ptfe 0.22 micron filter for chemicals-Voa Vial 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.