Housing, 37mm, 3Pc, 50/Box Back Catalog number: GCO37050 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9924-01 Cyclone, BGI4L Aluminum Cyclone (2.2LPM Respirable-US) (Uses 37mm Cassettes) Price on request 811-9927-09 Cyclone, Luer Adapter Replacement Kit Price on request 360-0135-01 GilAir PlusQuick Start Guide Price on request