13mm ptfe 0.2 micron filter Porex Acrodisc® Syringe Filters 4423 Acrodisc CR PTFE, 0.2 µm, 13 mm 100/300 4553 Acrodisc CR PTFE Minispike, 0.45 µm, 13 mm 100/300 4422 Acrodisc CR PTFE, 0.45 µm, 13 mm 100/300 4225 Acrodisc CR PTFE, 0.2 µm, 25 mm 50/200 4219 Acrodisc CR PTFE, 0.45 µm, 25 mm 50/200 4226 Acrodisc CR PTFE, 1 µm, 25 mm 50/200