Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended SC-2 Tedlar Bag (1.5L) Price on request 811-0921-01-R GilAir Plus impinger Bracket for single impinger h Price on request 850190-1-R Gilibrator 2 USB, Control Base Price on request