Nephelometer O-Ring, Replacement Back Catalog number: 385-0115-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GH37-2 Housing, 37mm 2pc Opaque, 50/Box Price on request 811-9922-01-R Single Unit Replacement Charger only, USB GilAir-3 Price on request GCU37AE-2 Cassette, 37mm 2pc w/ Type A/E Glass Fiber, 50/Box Price on request