Nephelometer O-Ring, Replacement Back Catalog number: 385-0115-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended SC-8 Tedlar Bag (25.0L) Price on request 911-0501-NO-R Single Unit Charger w/ Power Adapter, USB Gilibrator-2-No Cord Price on request 811-0913-01-R Outlet Fitting, Bag Fill Adapter Price on request