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Filter Minder® Air Line Filter Cartridge

Air Line Filter and Indicator

How it Works

Air Line Filter with IndicatorAir Line Filter with Indicator
Replacement Cartridge Below
The Air Line Filter and Indicator (ALFI) protects against harmful debris and contaminants in high pressure air lines in a wide variety of industrial, transportation and on-site applications requiring compressed air or gas.

When restriction becomes excessive, a bright red indicator deploys from the device, indicating it is time to change the filter.

If the stainless steel filter element become completely plugged, the device progresses into bypass mode to allow continued operation of your equipment.

The filter cartridge is replaceable with a 1-1/4” wrench/socket and is ready again to protect your operating assets in just seconds.




Mounts to a flat surface utilizing the two mounting holes with a 1/4" bolt/screw.

Air Line Filter CartridgeSpecifications

  • Up to 150 PSI
  • Standard Thread Size: 1/2 - 14 NPT
  • Anodized Aluminum Die Cast Housing
  • Stainless Steel Filter Screen Mesh and Dynamic Components
  • Total Weight: 0.6 lbs
  • Filter Cartridge Material: Nylon
  • -40°F to 200° (-40°C to 93°C) Temp Range


Overall Dimensions: 1-1/2” x 4” x 3-3/4”


  • Uses a wiping motion to keep switch contacts clean for a long service life

  • Molded-in integral connectors

  • Versatile design with many options

  • Highly dampened to prevent switch dither

  • Multiple mounting configurations


  • Continuously monitors filter condition and tell when filter is restricted

  • Opens or closes a switch at highest set point which provides a signal to the control module or light

  • Allows full use of filter capacity

  • Reduces down time and aids in maintenance planning

  • Reduces operational costs for end-users

  • Helps prevent excess fuel consumption due to a restricted filter