G300 Series Vented Oil Gage - Straight Male Base (1/8 to 3/8 pipe)

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The G300 Series vented brass oil gage has a straight hex base with male pipe thread. A shield with machined viewing window surrounds the tubular glass sight. 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:

  • Gage base machined from brass hex bar stock
  • Male tapered pipe thread base connection (1/8, 1/4 or 3/8 inch NPTF)
  • .39 inch wide viewing window, length varies from 1.79 to 7.33 inches depending on gage selected
  • 360° adjustment of viewing window
  • Suitable for use with most machine lubricating oils

Standard Materials:

  • Brass construction
  • Buna N seals
  • Borosilicate glass sight

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

Custom Modifications Available

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

Minimum quantities may apply.



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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