• Murphy by Enovation Controls

20V / 25V / A20V / A25V Series Vacuum Swichgage®

The 20 Series (2 inch/51 mm dial) and the 25 Series (2 1/2 inch/64 mm dial) Swichgage instruments are diaphragm-actuated, vacuum-indicating gages with built-in electrical switches. These switches are used for tripping alarms and/or shutdown devices.

Commonly used to measure loading of spark-ignition engines through intake manifold vacuum, the gages also can serve as overspeed protection from sudden loss of load on these engines. Use anywhere the vacuum source is compatible with port materials.


  • CE (European Conformity) mark
Specifications Downloads How to Order
Specifications Drawer: 

A pulsation dampener (PD2160) is included with each Swichgage to help eliminate pointer flutter. When monitoring intake manifold vacuum, the PD2160 is mounted in the manifold. The PD2160 has a 1/8-27 NPT connection.

  • Dial: White on black, dual USA/UK standard scale (U.S.A. standard scale is psi/kPa; U.K. standard scale is psi/bar)
  • Case
    • 20 and 25 series: plated steel
    • A20 and A25 series: polycarbonate
  • Bezel: Polished stainless steel, standard; others available
  • Lens: Polycarbonate, high-impact
  • Process Connection: 1/8-27 NPTM brass.
  • Sensing Element: Beryllium copper diaphragm.
  • ​​​Gage Accuracy: ±2% of scale in operating range (mid 1/3 of scale)
  • Adjustable Limit Contact: 2-SPST contacts; pilot- duty only, 2 A @ 30 VAC/DC. Contacts are gold flashed silver.
  • Limit Contact Adjustment: by a 1/16 in. hex wrench
  • Limit Contact Wire Leads (20 and 25 Series): 18 AWG (1.0 mm2) x 12 in. (305 mm)
  • Limit Contact Terminals: A20 Series number 4 screw terminals; A25 Series number 6 screw terminals
  • Unit Weight and Dimensions: See sales bulletin

WARNING: This product may expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information about California Propsition 65, go to www.P65Warnings.ca.gov or visit our California Proposition 65 page.

Literature Drawer: 

Additional product documentation can be found on our product support website or by clicking the Help Center button above.

Part NumberModel/DescriptionNotes
0570319420V-20: Vacuum Swichgage20 Series Model
0570319520V-30: Vacuum Swichgage20 Series Model
0570422725V-30: Vacuum Swichgage25 Series Model
05704330A20V-30: Vacuum SwichgageA20 Series Model
05704394A25V-30: Vacuum SwichgageA25 Series Model