Go-Cal Replacent Filter Back Catalog number: 811-9917-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GCU37AE-2 Cassette, 37mm 2pc w/ Type A/E Glass Fiber, 50/Box Price on request 811-9923-EU-R Single Unit Replacement Power Adapter, USB-Euro Co Price on request 811-0940-01-R Inlet Filter Replacement Housing for GilAir Plus Price on request