Filter, 37mm, 0.4µm, Polycarbonate, Plain White, 1 Back Catalog number: GFPC4537 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-0945-01-R GilAir Plus, DL to STP Upgrade (factory only) Price on request 297-0007-01-R Gilian 3/5/800i/5000/10i/12 Single Unit Charger Co Price on request 800320-1 Air Boss & Restrictor Kit, GilAir-3/GilAir-5 and B Price on request