Air Filter Restriction Gage
Air Filter Restriction Gage


  • 2 in. (51 mm) and 2-1/2 in. (64 mm) dia. Water Column Swichgage for detecting restricted dry air filters
  • Indicating Gage and Limit Switch in One
  • Use the switch to activate alarms and/or to shutdown equipment
  • Dependable and accurate
  • Dual scale reading
  • Dash mounting for easy viewing



The VWC Series Swichgage instruments are direct reading gages for use with dry air filters. As the filter deteriorates, air inflow will decrease creating increased vacuum between the air filter and the carburettor. The vacuum is monitored by the Swichgage instrument which gives a visual readout of the filter condition. A built-in adjustable limit contact can operate an alarm to alert the operator when it is time to service or replace the air filter element. Murphygage indicating-only instruments are also available.



The VWC Series Swichgage instruments can be used on any type of dry air filters for Gasoline or diesel engines.


They are particularly useful for engines operated in dusty environments such as agricultural and construction equipment, industrial engines and mobile equipment. Unlike traditional pop-up or latch-up type indicators, the VWC Series gives constant readout in meaningful terms of the changing condition of your filter.


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