Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 910-0913-NO-R GilAir-Plus STP 5-Pump Starter Kit, Bluetooth, No Price on request 811-1004-01 PM-2.5 Impactor Kit, Replacement for Models 810-10 Price on request 201044-10 Filter Housing, Front, GilAir-3/GilAir-5 Price on request