Teflon Bag, Septum Valve (50L) Back Catalog number: TE-28 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9932-02 Cyclone, Filter Cassettes, 37mm, European style fo Price on request 811-1004-01 PM-2.5 Impactor Kit, Replacement for Models 810-10 Price on request 910-0205-02 GilAir-3 Clock [ATEX], 5-Pack (With Universal 5-Un Price on request