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Many combinations. Several colors with amazing finishes.

Easy Turn Fill Caps and Bungs

Easy Turn Fill Cap with Aluminum Weld Bung

Easy Turn Fill Cap with Aluminum Weld Bung


Easy Turn Fill Cap with Steel Weld Bung

Easy Turn Fill Cap with Steel Weld Bung


Easy Turn Fill Cap with Stainless Steel Weld Bung

Easy Turn Fill Cap with Stainless Steel Weld Bung


Easy Turn Fill Cap with Aluminum Bolt-On Bung

Easy Turn Fill Cap with Aluminum Bolt-On Bung


Easy Turn Fill Cap with Lanyard Boss and Aluminum Fuel Cell Bung

Easy Turn Fill Cap with Lanyard Boss and Aluminum Fuel Cell Bung


Lanyard Chain Kit, Stainless Steel

Lanyard Chain Kit, Stainless Steel


Easy Turn Fill Cap with Aluminum Remote Mount Bung

Easy Turn Fill Cap with Aluminum Remote Mount Bung


Easy Turn Fill Cap with O-Ring

Easy Turn Fill Cap with O-Ring


Weld Fill Cap Bung

Weld Fill Cap Bung


Bolt-On Aluminum Fill Cap Bung

Bolt-On Aluminum Fill Cap Bung


Bolt-On Fuel Cell Aluminum Fill Cap Bung

Bolt-On Fuel Cell Aluminum Fill Cap Bung


Aluminum Remote Mount Fill Cap Bung

Aluminum Remote Mount Fill Cap Bung


Easy Turn Fill Cap Replacement O-Ring, Buna Material

Easy Turn Fill Cap Replacement O-Ring, Buna Material


Easy Turn Fill Cap Bolt-On Bung Replacement O-Ring, .103 Inch Thick Buna Material

Easy Turn Fill Cap Bolt-On Bung Replacement O-Ring, .103 Inch Thick Buna Material


Easy Turn Fill Cap Bolt-On Fuel Cell Bung Replacement Gasket, 1/16 Inch Thick Buna Material

Easy Turn Fill Cap Bolt-On Fuel Cell Bung Replacement Gasket, 1/16 Inch Thick Buna Material


NPT Female Weld Bung

NPT Female Weld Bung


AN Thread Weld Bung

AN Thread Weld Bung


Fill Caps and Bungs

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

Turn heads while working on your race car 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 on your hot rod. 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.

The proprietary color finishing processes are available in your choice of either brilliance anodized black, red and blue or micro-polished aluminumresulting in unmatched jewelry quality finishes.

The right size matters.

capsizes Easy Turn Fill Cap with O-Ring

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.

Popular uses for Easy Turn Fill Caps include:

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


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 !

Proudly made here in the USA.

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

Customer Comments:


"I use your bolt on caps and bungs on my carbon fiber Cummins common rail valve covers. Love the quality. Thank you."
             Randy Davis, Owner of OldSkoolFab, Inc.



"I upgraded my fuel cell to an Easy Turn fill cap assembly. It wasn't long until all my friends did the same. Great product!"
             As shared with us at the
PRI Show

Finish Your Tank

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

Click the images below to view all the options.

FemaleSteelFull NPT Female Weld In Bung

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