Filter, 37mm, 0.4µm, Polycarbonate, Plain White, 1 Back Catalog number: GFPC4537 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9922-01-R Single Unit Replacement Charger only, USB GilAir-3 Price on request GF25120 Filter, MCE 1.2µm 25mm, 100/Pack Price on request 811-0501-01 Flow Monitoring Software Kit (Software, Cable, & M Price on request