Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 298-0027-01 Charger, Smart Lithium Ion 100 to 240VAC for Nephe Price on request 297-0012-01 USB Communications Cable for Nephelometer Price on request 800885-171-2301 GilAir-5 RC Pump, Starter Kit, 230V Euro Style Plu Price on request