Cyclone, 37mm Filter Screen Back Catalog number: 811-9927-08 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 GF37TQ Filter, Tissue Quartz, (99.90% retention of 0.3µm Price on request 800573-4 Diagnostic Panel only, Low (2-50cc, 20-200cc, 50-8 Price on request