Quantity Your Price
1 $14.99



1-1/4-12 Straight Thread
1-1/2 in. Outside Diameter Bung
1/2 in. Bung Height

Fits 1-5/8 in. Easy Turn Fill Caps

Made in the USA

Built-in features and extra height

There are several options listed here to meet your unique application; those that are taller aren't available in complete assemblies (only offered by themselves), requiring a signature Pro-werks Easy Turn Fill Cap to be purchased separately to build a complete package.

You’ll appreciate the stepped shoulder in the base of the bung - it serves as a positioning locator during the fabrication process.

Precision machined of weld-able Mild steel, and sized properly for the "radially squeezed" O-ring standard of the Pro-werks Easy Turn Fill Cap.

Note: Welding should always be performed by a qualified welder.

The bolt-on style bung selection is also available, and do not require welding; select anodized colors are available and include mounting hardware - so you won't need to run all over town looking for it!

Great caps. Great colors.

These bungs utilize the popular non-vented Easy Turn Fill Caps that are available variety of Pro-Werks Brilliance anodized colors or beautifully Micro-polished aluminum finish - the finishes are impeccable.

The right size matters.

Easy Turn Fill Caps come in many sizes and are packaged as complete assemblies with your choice of one of the many versatile mounting options, or each component is also available separately.

Be sure to check out the entire line up - Billet aluminum Easy Turn Fill Caps are a Pro-Werks specialty.   Watch the Video below to learn more !

Both the Cap and Bung are precision CNC machined from billet aluminum, right here in the USA.

Finish Your Tank

We also offer a full line of weld-in plumbing bungs to complete your tank project.

Click the images below to view all the options.



How do I properly weld my bung?


Apply several small, equally spaced tacks and preheat before welding. Keep the weld small to minimize potential distortion or shrinkage.



If my threads are tight after welding, how do I fix it?


The solution is simple. Apply a small amount of fine grit lapping compound to the threads then turn the cap back and forth in the bung until the desired fit is achieved. Be patient−do not force the process. Thoroughly clean both sets of threads before use.


Steel Weld-In Bungs: C73-745
Outised Diameter: 1.5 in.
Thread: 1-1/4-12
Height: 0.5 in.