Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 375-0008-01 Protective Rubber Boot for Nephelometer Price on request 910-0912-EU-R GilAir-Plus Data Logging 5-Pump Starter Kit, Bluet Price on request GF37TQ Filter, Tissue Quartz, (99.90% retention of 0.3µm Price on request