0.22 um Syringe Filters – Grainger Industrial Supply Syringe Filter, 25 mm Membrane Dia., 0.22 um Pore Size, Hydrophobic PTFE Filter Material Item # 12K964 Mfr. Model # 12K964 25mm 0.2 um ptfe syringe filter Ec21-Voa Vial Supplier Syringe Filter, PTFE, 25mm diameter, 0.2um, 100/pk (Scientific Strategies # FPT250020-100PK