Cassette, 37mm 2pc 5.0µm PVC, 50/Box Back Catalog number: GCU37500PVC-2 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-1004-04 PM-4.0 Impactor Kit, Replacement for Models 810-10 Price on request 811-0505-01-R Single Unit Replacement Charger only, USB Gilibrat Price on request 811-9917-01 Go-Cal Replacent Filter Price on request