Cyclone, 37mm Filter Screen Back Catalog number: 811-9927-08 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 800893 Valve Plate Assy-Bottom GilAir 5 Price on request 385-0117-01 Tri-pod mounting bracket for Nephelometer (Tri-pod not included) Price on request 811-0908-EU-R Power Supply, Single Station 100-240Vac, 50-60 Hz, EU Cord Price on request