Syringe Filter, PTFE, 30mm diameter, 0.22um, 100/PK - amazon.com
SimPure 10 Pack Sterile Syringe Filter PES, 0.22um Pore Size, 33mm Membrane Diameter, Hydrophilic Filtration High Throughput Sterile Packed Individually 4.2 out of 5 stars 190 1 offer from $13.99