Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GB37Y Band, 37mm Shrink, Yellow 100/Pack Price on request 201050 Filter, Replacement, GilAir-3/GilAir-5/BDX II Price on request C-B100M BioVOC Disposable Cardboard Mouthpieces, pk 100 Price on request