Filter Minder® Graduated Air Filter Indicator - Grommet Mount Model No. 133501 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. Mounting Mounts in a rubber grommet directly to air cleaner housing or air induction piping. Rubber grommet available. Specifications Vacuum Indicator (differential and pressure available) Locking type (non locking avaliable) Operating Temperature: -40 to +250°F (-40 to +121°C) Standard Calibration: 8-35" water vacuum (2-8.7kPa) at the red zone Accuracy: ±10% at red zone Material: Polycarbonate housing Dimensions Length: 85 mm Diameter: 50 mm   HOME WHAT WE DO HISTORY CAPABILITIES PRODUCTS CONTACT   Engineered Products Co. 2940 Airport Blvd. Waterloo, IA 50703 Ph: (319) 234-0231 Fax: (319) 234-8922 info@filterminder.com