Cyclone, 37mm Filter Screen Back Catalog number: 811-9927-08 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9917-03 Go-Cal Replacent Battery Pack Price on request 811-9924-01 Cyclone, BGI4L Aluminum Cyclone (2.2LPM Respirable-US) (Uses 37mm Cassettes) Price on request GCU37500PVCPW Cassette, 37mm, 3pc, 5.0µm, PVC, Preweighed, (100µg) 50/Box Price on request