Billet Proof® “Sight Glass” External Fuel Gauge - Brass - Includes 3/4” Aluminum Stepped Flanged Tophat Bung

(2 reviews) Write a Review

Because running out of gas sucks. Everything you need to mount to your aluminum gas tank!


Brass Sight Glass - 3/4" male NPT (dryseal) 1-1/8" Hex.

Glass - Shatter resistant and Temperature resistant from -40 deg to 180 def F.

Aluminum Bung (6061) - 3/4" female NPT, 1-1/8" OD with a .25" Step (No more dropping the bung in your tank during installation).

• Compatible with gas, gasohol and oil.

• We also offer an External Hose Kit.



A universal fit item that should mount to just about any aluminum tank or oil bag.

Make sure that the you will have room for the bung and sight glass prior to purchase.


Make sure to check out our installation video for a headache free fabrication!

2 Reviews Hide Reviews Show Reviews

  • 5
    Awesome Product

    Posted by Fab Country Outfitters LLC on 1st Mar 2021

    These sight glasses are top notch and excellent. We use them on our custom built aluminum tanks to check fuel level. Best on the market and awesome customer service.

  • 5
    Billet Proof Sight Glass

    Posted by Unknown on 17th Jun 2020

    Very nice product!!! Made in America and awesome customer service A+