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 the filter. Change filters when resistance becomes excessive. Failure to change filter may result in housing rupture, which . ...