Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 817-0305-02 LFS-113 Atex W/Timer Upgrade Kit 11-15-06 (Author Price on request 800844-1-230 Gilibrator-2Low Flow Diagnostic Kit, 230V, EU Cord Price on request 817-0305-01 LFS-113 Atex Basic Upgrade Kit 10-17-06 (Autho Price on request