G620 Series Back Mount Redline Sight Gage - Front Viewing With Dial Thermometer

View Larger

The G620 Series back mount closed circuit sight gages provide front viewing of the fluid level clearly delineated by a redline on white background integral to the sight glass all secured within an aluminum body (HIGH-LOW markings). A wetted dial thermometer provides an analog display of the fluid temperature.

Standard Features:

  • Centerline lengths from 3 to 12 inches
  • Back mount
  • .90 inch SQ body machined from extruded aluminum bar stock
  • Fluid level visible from front of gage (.50 inches wide)
  • Viewing enhanced by redline on white background integral to sight glass
  • 1.38 inch diameter dual scale dial thermometer, 50° to 300°F and 10° to 150°C
  • Aluminum tube shields thermometer probe extending into reservoir
  • HIGH-LOW markings on aluminum body
  • 1/2-20UNF mounting studs accommodate reservoir wall thicknesses up to .75 inches
  • Suitable for use with most hydraulic and machine lubricating oils

Access to inside of reservoir is required to mount this style sight gage.

Standard Materials:

  • Aluminum construction
  • Buna N seals
  • Borosilicate glass sight
  • Zinc plated, steel hex nuts


  • Not recommended for use with steam, acidic fluids, caustic fluids and volatile fluids.
  • If aluminum construction is selected for a water application, anodizing is recommended.
  • Reservoir must be drained to remove dial thermometer or loss of fluid will occur

Product Options

Common Modifications Available

  • Body Material: Brass, Stainless Steel or Carbon Steel
  • Seal Material: Butyl, Fluorocarbon (Viton®), Ethylene Propylene (EPDM) or Neoprene
  • Centerline lengths

Custom Modifications Available

  • Sight Options: Polycarbonate or Clear Borosilicate (Ball Float Indicator)
  • Surface Treatments: Clear/Color Anodize, Zinc, Nickel or Chrome Plate
  • Fluid Level Markings: Custom Text, ISO Symbols or No Markings
  • Mounting Bolt Threads: 1/2-13UNC, M12x1.75 or M10x1.50
  • Viewing Direction: Right, Left, Front or Any Combination, Corner Viewing

Minimum quantities may apply.

Related Products

If the G620 Series sight gages are not exactly what you need, consider other LDI products 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:


CAD Files


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

Cross Reference