Teflon Bag, On-Off Valve (0.5L) Back Catalog number: TE-22 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended SC-2 Tedlar Bag (1.5L) Price on request SC-3 Tedlar Bag (1L) Price on request 811-1004-01 PM-2.5 Impactor Kit, Replacement for Models 810-10 Price on request