Filter Minder® Graduated Air Filter Indicator - Dash Mount Model No. 168501 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 panel or dash for convenience of the driver or operator. An illuminated version is available. Bezels in chrome, black, or green. Air cleaner fittings, and vacuum hose available. Specifications Vacuum Indicator (differential and pressure available) Locking type (non locking available) 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: 61 mm Diameter: 59.7 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