Skip to content

Easy Turn Fill Caps and Bungs with many combinations, several colors and amazing finishes.

Custom-fabricated tanks, Fuel cells, Rear End housings, Valve covers, Overflow tanks, Intercooler ice boxes, Ballast tanks, Inspection viewing ports

Fill Caps and Bungs

Many combinations. Amazing finishes.
Safe. Secure. Sexy.

Turn heads while working on your race car or hot rod with Pro-werks' signature Easy Turn Fill Caps. Once you've added one of these amazing assemblies, you'll want to install one at every location possible. And you may find yourself checking things more often, just to get your hands on the Easy Turn cap again!

These lightweight, non-vented Pro-werks Fill Caps feature deep finger notches for a positive and comfortable grip, this design is another Pro-werks innovation, appreciated by everyone who uses them.

 


Precision Matters.


We start with American melt 6061-T6 billet aluminum; it is precision CNC machined to exacting standards for proper fit and to create the foundation for obtaining amazing finishes.

 

This design uses a "radial squeeze" action on a Buna O-ring for a secure seal. Precision machined quick-start coarse threads make using these caps a breeze.


The large selection of Pro-Werks mounting bungs are crafted from Steel, Aluminum or Stainless Steel and available in both Weld-in and Bolt-on styles.

Great Caps. Great Colors.

To compliment the color coordination of your project, the caps are finished off in Pro-Werks Brilliance anodized colors in your choice of Black, Red, Blue, or beautifully Micro-Polished aluminum – 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.

capsizes Easy Turn Fill Cap with O-Ring

Popular uses for Easy Turn Fill Caps include:

  • Custom-fabricated tanks
  • Fuel cells
  • Gas tanks
  • Rear End housings
  • Valve covers
  • Overflow tanks
  • Ice boxes for intercoolers
  • Ballast tanks
  • Inspection viewing ports


Proudly Made in the USA

Be sure to check out the entire line up - Billet aluminum Easy Turn Fill Caps are a Pro-Werks specialty.

You can always count on Pro-Werks to do it right!

 


Finish Your Tank

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

FemaleSteelFull NPT Female Weld In Bung

Click the images above to view all the options.

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

Back to top