Keep your AirDog Fuel Preporator operating at an optimum level with new fuel filters from Pureflow Technolgies. These 2 micron replacements fit Original AirDog and AirDog II filtration systems. A plugged fuel filter can cause low fuel pressure and hamper flow to your diesel engine’s injection pump. Avoid issues by being proactive with preventative maintenance; have a spare filter ready for when you need it.