Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GH37-2 Housing, 37mm 2pc Opaque, 50/Box Price on request 810-1501-01 Gilian 10i Pump Kit UL ATEX, Pump Only, No Charger Price on request 380-0035-01 Nephelometer Pump Assy, Replacement Price on request