G623 Series Front Mount Rigid Nylon Sight Gage - 180° Viewing

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G623 Series front mount closed circuit low profile sight gages are molded from a clear nylon providing 180° of viewing. A white insert integral to the sight gage helps draw eye contact to the fluid level quickly.

Standard Features:

  • 5 inch centerline length
  • Front mount
  • Tough, break resistant, transparent molded nylon gage body
  • 1.12 x .59 inch gage body profile
  • 180° of viewing fluid level (without metal guard)
  • Viewing enhanced by white background integral to molded gage body
  • 1/2-13UNC threaded mounting bolts accommodate reservoir wall thicknesses up to .60 inches
  • Suitable for use with most hydraulic and machine lubricating oils

Standard Materials:

  • Constructed with a molded, transparent nylon
  • Buna N seals


  • Not recommended for use with alcohol or steam

Temperature & Pressure Ratings

  • 212°F (100°C) maximum operating temperature
  • 50 psi (345 kPa) maximum operating pressure at 70°F (21°C)

Product Options

Common Modifications Available

  • Fluorocarbon (Viton®) seals
  • Black powder coated steel guard (limits viewing to front only)
  • M12x1.75 threaded mounting bolts

Minimum quantities may apply.

Related Products

Refer to other LDI gage series in both rigid and flexible nylon material with expanded viewing capabilities or functional  enhancements:

If your application exceeds the capabilities of a nylon sight gage, consider metallic LDI products also designed for viewing or monitoring fluid media.

Your fluid storage system is not complete until you define the reservoir.  Off-the-shelf or customized to your specifications, consider LDI your source for:



LDI - Corporate  Click for map LDI   Click for map
Precision Machining & Assembly Fabrication & Assembly
1864 Nagle Ave. 12901 Jim Dhamer Dr.
Manitowoc, WI  54220 Huntley, IL  60142
PH: 920.682.6877                         
FAX: 920.684.7210                         



Our talented team of degreed and professionally certified Engineers, Quality Assurance, Production and Customer Service staff have many years of experience in the industry.  Their attention to detail and ability to collaborate with our clients to solve their problems is reflected in the 50+ years we have been in business.


Customer Service: 

920.682.6877, option 4

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