Nephelometer O-Ring, Replacement Back Catalog number: 385-0115-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended SC-7 Tedlar Bag (12.0L) Price on request GCS25455-50 Cassette, 25mm, Classic Style TEM, 0.45µm, MCE, 50 Price on request GF25TQ Filter, Tissue Quartz, (99.90% retention of 0.3µm Price on request