GilAir Plus, DL to STP Upgrade (factory only) Back Catalog number: 811-0945-01-R Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 783-0007-01 Battery Pack, Replacement for Gilian 5000, 800i & Price on request 375-0008-01 Protective Rubber Boot for Nephelometer Price on request GF25TQ Filter, Tissue Quartz, (99.90% retention of 0.3µm Price on request