Acrodisc Syringe Filters With PTFE Membrane, 25 mm 4225 0.2 µm 50/pkg, 200/cs NA 0 4521 0.2 µm 1000/pkg NA 0 4518 0.45 µm AutoPack™ tubes 25/pkg, 200/cs NA 0 4219 0.45 µm 50/pkg, 200/cs NA 0 4501 0.45 µm 1000/pkg NA 0 4226 1 µm 50/pkg, 200/cs NA 0 4503 1 µm 1000/pkg NA 0 Acrodisc Syringe Filter with PTFE Membrane, 4 mm