Diaphragm Seals, Gauge Guards and Isolators

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H2O Rx supply diaphragm seals, gauge guards and isolators to isolate and protect instrumentation, such as pressure gauges, transducers and vacuum instruments, from the fluid whose pressure is being measured. To avoid confusion, diaphragm seals, gauge guards and isolators are intechangeble names for this equipment.

H2O Rx's diaphragm seals, gauge guards and isolators facilitate guage and switch accuracy by isolating and protecting this instrumentation against erratic pressue spikes, chemical corrosion, extreme fluid temperature, and clogging.

H2O Rx work with you to select the most appropriate materials and pressure range of the diaphragm seal, gauge guard and isolator for each application. We can also supply pressure gauges, transducers and vacuum instrumentation with the diaphragm seals, guage guards and isolators.

An additional service can also be supplied to fit and fill the diaphragm seals and guards with a choice of silicon or glycerine oil.

H2O Rx is the Asia Pacific Distributor for SENTINEL Diaphragm Seals, Gauge Guards and Isolators for their superior strength and durability.


  • Ensure gauge and switch accuracy
  • Smooth out erratic pressure surges
  • Extend the life of pressure instrumentation
  • Protect gauges from freezing and slurries
  • Protect gauges and other pressure instruments from contamination, corrosion and clogging
  • Get accurate and consistent readings when working with corrosive or obstructive fluids
  • Reduce capital costs by replacing expensive gauges with low cost utility gauges


  • Accuracy of ±2% full deflection
  • Simple and quick installation
  • Pressure ranges up to 6895 kPa (1000 PSI )
  • Works for pressure and vacuum
  • 1/4” and 1/2” inlet ports - BSP or NPT
  • Custom models available

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Additional Resources


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Get it from the Clouds

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What can a diaphragm seal, guard or gauge isolator do for you? Watch the video! Diaphragm Seal, Guard or Gauge Isolators

To request a DVD, click here.

H2O Rx Pty Ltd


+61 409 784 236


Last Updated: 29 August, 2019