Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 801863-171-2301 BDX II Starter Kit, 230V Price on request 800844-2-230 Gilibrator-2 Standard Flow Diagnostic Kit, 230V, E Price on request 911-0502-NO-R Single Unit Charger w/ Power Adapter, USB Gilibrat Price on request