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Murphy 30Hg Vacuum Swichgage 20VWC-30

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Murphy 0-30Hg Mechanical Air Filter Restriction Swichgage 2 in. with Plated Steel Case - 20VWC-30

Product Condition: NEW
Murphy Mechanical Air Filter Restriction Swichgage 30Hg with Plated Steel Case 20VWC-30
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

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The Murphy 0-30Hg Mechanical Air Filter Restriction Swichgage 20VWC-30 is a direct reading gage for use with dry air filters. As the filter deteriorates, air inflow will decrease creating increased vacuum between the air filter and the carburetor. The vacuum is monitored by the Swichgage 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.

The 20VWC-30 features a steel case with standard range of 0-30 inches (0-76 cm) of water restriction. This Swichgage instrument can be used on any type of dry air filters for Gasoline or diesel engines.  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.



  • 2 in. (51 mm) Dial
  • Plated Steel Case
  • 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 Shut Down Equipment
  • Dependable and Accurate
  • Dual Scale Reading
  • Dash Mounting for Easy Viewing


  • Part No.: 20VWC-30
  • Range: 0-30 in. (0-76 cm) H20 vac
  • Contact Rating: 2 A @ 30 V AC/DC
  • Contact Adjustment: Allen head
  • Wire: 18 AWG x 12 in. (1.0 mm2 x 305 mm)
  • Dial: White on black
  • Clamp: Metal
  • Mounting Hole: 2-1/16 in. (52 mm)
  • Maximum panel thickness: 1/4 in. (6 mm)
  • Port: Brass 1/8-27 NPT
  • Bezel: Stainless steel
  • Case: Plated steel
  • Lens: Polycarbonate
  • Mounting Studs: 10-32 UNF
  • Calibration: ± 3 in. (76 mm) H2O across scale
  • Unit Weights: 8 oz (249 g)
  • Unit Dimensions: 3 x 2-3/4 x 2-3/4 in. (76 x 70 x 70 mm)

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Product Condition NEW
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