Shopping Cart: $0.00

Murphy 0-75 PSI Water Pressure Swichgage with Lockout 20PW7-75

More Views

Murphy 0-75 PSI Water Pressure Swichgage 2 in. with Lockout - Plated Steel - 20PW7-75

Product Condition: NEW
Murphy Mechanical Water Pressure Swichgage with Lockout 0-75 PSI 20PW7-75

Availability: In stock

Regular Price: $73.69

Special Price: $70.01

SSL Cerficate

The Murphy 0-75 PSI Water Pressure Swichgage 2" with lockout 20PW7-75 is a diaphragm-actuated pressure-indicating gage with a built-in electrical limit switch. This swichgage is used for tripping alarms and/or shutdown devices. The gage mechanism is enclosed in a steel case coated to resist corrosion. A polycarbonate, break-resistant lens and a polished, stainless steel bezel help protect this rugged, built-to-last instrument. Accuracy and protection from moderate overpressure is assured by a unique, unitized diaphragm chamber. A built-in pulsation dampener helps eliminate pointer flutter and is removable for cleaning.

This unit includes a front, semi-automatic lockout for startup override. This built-in device holds the pointer away from the contact on startup. When pressure exceeds the set point, the lockout is automatically disengaged. The low limit contact can be by-passed on start-up by pushing the lockout button. It holds the pointer away from the shutdown contact while the engine starts.  The lockout will disengage automatically on rising pressure.

The gage pointer acts as a pressure indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contacts are grounded through the case and have a self-cleaning motion to ensure electrical continuity. Specifically designed to protect engines and equipment in oil field, marine, irrigation, construction and trucking applications to monitor water pump pressure. Exceeds SAE standards.


  • 2 inch/51 mm Dial
  • Steel Case Coated to Resist Corrosion
  • Polycarbonate, Break-Resistant Lens
  • Polished, Stainless Steel Bezel
  • Combination Indicating Gage and Limit Switch
  • Switch Can Activate Alarms and/or Shutdown Equipment
  • Exceeds SAE Standards
  • Semi-Automatic Lockout



  • Part No.: 20PW7-75
  • Range: 0-75 psi (517 kPa) [5.0 bar]
  • Maximum Pressure: 2 x scale
  • Standard Settings: 15 psi (103 kPa) [1.0 bar]
  • High Settings: 60 psi (414 kPa) [4.0 bar]
  • Dial: White on black, dual scale; U.S.A. standard scale is psi/kPa
  • Case: Plated steel; mounting clamp included (except for direct mount models)
  • Bezel: Polished stainless steel
  • Lens: Polycarbonate, high-impact
  • Oil: Silicon Oil
  • Temperature Range: Ambient: -40°F (-40°C) thru 150°F (66°C); Process: -40°F (-40°C) thru 250°F (121°C)
  • Process Connection: 1/8-27 NPTM brass
  • Sensing Element: Beryllium copper diaphragm
  • Adjustable Limit Contact: SPST contact; pilot- duty only, 2 A @ 30 VAC/DC; Normally Close (NC) when the low limit is met. Normally Open (NO) when pointer is in normal operating range. Contacts are gold flashed silver
  • Limit Contact Adjustment: by a 1/16 in. hex wrench thru 100% of the scale
  • Limit Contact Wire Leads: 18 AWG (1.0 mm2) x 12 in. (305 mm)
  • Unit Weight: 8 oz. (0.23 kg)
  • Unit Dimensions: 3 x 3 x 3 in. (76 x 76 x 76 mm)



Additional Information

Product Condition NEW
upc No

Customer Reviews

Write Your Own Review

Only registered users can write reviews. Please, log in or register