Single Position Indicator Purpose: Continuously monitors air filter restriction. How It Works: The window turns red when the maximum air filter restriction has been reached. The filter should then be replaced. Benefits Tells when to change the air filter Helps with troubleshooting low power Helps prevent excess fuel consumption due to restricted air filter Allows full use of filter capacity Reduces operational costs Features Durable heavy dty design Large easy-to-read window Private labeling available. Specifications Vacuum Indicator Operating Temp. -40o to +250oF (-40o to +121oC) Calibration 6-40" H20 (1.5-10kPa) vacuum +-10% at 15 to 40" Material Polycarbonate housing Mounting Direct to air cleaner 1/8" pipe thread 3/8" straight thread M-10 metric Remote mount with bracket Dimensions Length 46.9 mm Diameter 47.5 mm