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 SC-4 Tedlar Bag (3L) Price on request GFPC837 Filter, 37mm, 0.8µm, Polycarbonate, Plain White, 1 Price on request GH37SR-2 Housing, 37mm 2pc Solvent Res, 50/Box Price on request