Reliance® Flat Glass Water Gages & DuraStar Illumination

Flat Glass Water Gages

450 – 2000 PSI


The precision manufacturing of these time-tested designs assures outstanding performance and service life.  Choose from single, double, or triple windows for ultimate visibility.


Clark-Reliance FG Series Flat Glass Gages feature four functional designs.

FG Series Gages provide wide-body construction for added strength and rigidity.  Tempered flat glass composition of premium quality to resist thermal shock.  All glass is tested for surface trueness prior to assembly and is protected with a high-quality mica shield for steam applications.

All models feature finger-clamps which impart a uniform, perpendicular load across the glass surface, assuring gasket tightness.  This design allows easy dismantling for cleaning and servicing.

A window slot, 5/8″ wide, provides high visibility gage reading.  For many installations, Water Gage Illuminators are recommended to improve gage readability.




FG water gage







Durastar logo

The Most Dependable LED Illuminator for all Reliance Flat Glass Level Gages

  • High Contrast
  • Superior Visibility Day or Night
  • Field Upgradable
  • Maintenance Free
  • Long Life ~ 100,000 hrs.
  • No Heat Generation
  • Versatile
    • Continuous or “On-Demand”
  • Amber LED’s for high intensity “star-like” image of the water line
  • Longest Field-of-View
  • Pays for itself in electricity savings alone!
  • NO weather-proof illuminator hood used
  • Models for Ordinary or Classified Locations

Clark-Reliance is pleased to announce the addition of the DuraStar to the world’s largest selection of level indication and control products for the boiler industry.  The DuraStar is approved for use in Class 1, Div. 1, Group B, C & D environments.  Contact your local representative or a Reliance Applications Engineer to configure a DuraStar for your transparent glass level gages.

durastar specs


durastar 1


durastar 2


Brochures: Flat Glass Water Gages & DuraStar LED Illuminator

Order Selection Worksheet: R406.005 Flat Glass Water Gages

Drawings: Flat Glass Water Gages

DuraStar LED Illuminator For Flat Glass Water Gages

IOMs: Flat Glass Water Gages

DuraStar LED Illuminator For Ordinary (Not Classified) Locations

DuraStar LED Illuminator For Classified Area (Hazardous) Locations