Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GCO37DNL Band, 37mm Shrink, White, 1000/Pack Price on request 360-0201-01 Operation Manual/Software CD for Deluxe Nephelomet Price on request 811-9926-01 Cyclone, GK2.69 Aluminum Cyclone for 37mm Casset Price on request