GT100 Series Vented Oil Gage - Male Elbow (1/4 to 3/4 pipe) with Dial Thermometer

View Larger

The GT100 Series vented brass oil gage has a male elbow base and integral, wetted dial thermometer providing direct reading of the fluid temperature. The viewing window has 360° adjustment for optimal orientation to view fluid after installation. The sealing gaskets are contained on both their ID and OD to facilitate trouble-free assembly after on-site repositioning of the viewing window.

Standard Features:

  • .88 inch SQ base
  • Machined from brass bar stock
  • Male tapered pipe thread base connection (1/4, 3/8, 1/2 or 3/4  inch NPTF)
  • .39 inch wide viewing window, length varies from 1.33 to 7.33 inches depending on gage selected
  • 1.38" diameter dual scale dial thermometer, 50° to 300°F and 10° to 150°C
  • 360° adjustment of viewing window
  • Suitable for use with most machine lubricating oils

Standard Materials:

  • Brass construction
  • Buna N seals
  • Borosilicate glass sight


  • When installing oil gage in a confined space, disassemble the base subassembly from the rest of the oil gage. The base subassembly consists of the pipe adapter, base and thermometer. Install the base subassembly separately to the reservoir. Once base subassembly is in position and secure, reassemble the loose oil gage components to the base.


  • Reservoir must be drained to remove dial thermometer or loss of fluid will occur.

Temperature Rating

  • Maximum operating temperature of 250°F (121°C) with standard Buna N seals. For applications not compatible with Buna N seal material, consult factory for available options and corresponding temperature ratings.

Product Options

Common Modifications Available

  • Body Material: Aluminum
  • Seal Material: Butyl, Fluorocarbon (Viton®), Ethylene Propylene (EPDM) or Silicone
  • Sight Material: Polycarbonate, Redlined Glass
  • Vent Cap Options: male pipe, female pipe, tube fitting, non-vented, filter or filler cap
  • Adjustable fluid level indicator rings
  • Two viewing windows machined into shield
  • Add drain to gage base

Custom Modifications Available

  • Body Material: Carbon Steel or Stainless Steel
  • Surface Treatments: Zinc, Nickel or Chrome plate

Minimum quantities may apply.

Related Products

Oil gage series with thermowells are available that allow rotation of the thermometer face after installation for optimal temperature viewing.



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