Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-1604-NO Gilian 12 Power Module, No Cord Price on request 800510-171-2305 GilAir-3 RP Pump, 5-Pack with Universal 5-Unit Cha Price on request 811-9925-01 Cyclone, GK4.162 -RASCAL Cyclone (9LPM Respirable- Price on request