Filter Minder® Graduated Air Filter Indicator

Product Announcement from Filter Minder®

Filter Minder® Graduated Air Filter Indicator-Image

Model No.
135501 (1/8" pipe thread)
136501 (3/8" straight thread
137501 (M-10 thread)

How Does It Work?

The graduated indicator monitors engine air filters. The position indicator progressively fills the window as air filter restriction increases, locking at the highest restriction. The air filter should be changed when the position indicator reaches the red zone.


Mounts directly to air cleaner or air induction piping. Adapter fittings are available.


  • Vacuum Indicator (differential and pressure available)
  • Locking Type (non-locking is available)
  • Operating Temperature: -40 to +250°F (-40 to +121°C)
  • Accuracy: ±10% at red zone
  • Material: Polycarbonate housing
  • Standard Calibration: 8-35" water vacuum (2-8.7kPa) at the red zone