Filter inside low flow modules 800518 & 800519 Back Catalog number: 201119 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 783-0014-01-R GILAIR PLUS BATTERY PACK, DC BACK PACK Price on request 563-0609-06-R 3/8" ID PVC Tubing, per foot Price on request 201116 NAMEPLATE for Constant Flow, Low Flow Module 800518 Price on request