Cyclone, BGI4L Gasket Back Catalog number: 811-9927-04 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 202046-72 Hose for 72" Sampling Mast, Aircon-2 Price on request 800883-171 GilAir-5 R Pump, No Charger Price on request 780-0015-04-R Calibrator cable (BIOS Defender 510-M), for automatic cal option Price on request