Easy Turn Fill Caps

Pro-werks lightweight, non-vented Easy Turn fill caps feature positive grip finger notches that are comfortable to grab and easy to turn. The attractive design is CNC machined from 6061-T6 billet aluminum and features quick-starting coarse threads. A positive sealing radial squeeze Buna O-Ring holds the cap secure.

Easy Turn Fill Caps are available many sizes and mounting configurations to fit almost any application.

Mounting bungs are crafted from steel, aluminum or stainless and available in both weld-in and bolt-on styles. 

Popular uses for Easy Turn Fill Caps:
  • Custom-fabricated tanks
  • Fuel cells
  • Rear End housings
  • Valve covers
  • Overflow tanks
  • Ice boxes for intercoolers
  • Ballast tanks
  • Inspection viewing ports
To compliment the colors of your project, Easy Turn fill caps are available in four Brilliance anodized colors: black, red, blue and silver or beautifully micro-polished aluminum. The color and sheen of Pro-werks Easy Turn Fill Caps is unmatched. 

Proudly Made in the USA.

"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 by 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