Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9917-02 Go-Cal Replacent Tubing Kit Price on request 811-9901-01 Gilian Bag Sampling Kit with Jar (Use SC-1 or SC-3 Price on request 783-0012-01-R Battery Pack NiMH Rechargeable Price on request