Go-Cal Replacent Filter Back Catalog number: 811-9917-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GH37SR Housing, 37mm 3pc Solvent Res 50/Box Price on request GCU37500PVCPW100 Cassette, 37mm 2pc 5.0µm, PVC Preweighed, 50/Box Price on request 385-0112-01 Sheath Air Purge Flow Filter for Nephelometer Price on request