Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GB37C1000 Band, 37mm Shrink, Clear 1000/Pack Price on request 360-0138-01 Operation Manual/Software CD for Nephelometer, TSP model only Price on request 910-0105-02 GilAir-5 Clock [ATEX], 5-Pack (With Universal 5-Un Price on request