Holley Equipped Billet Fill Cap

Aluminum Weld Bung

PART# 241-228

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Looking for an alternative to your stock fuel cell cap or maybe you need a fill cap for that custom oil tank or valve cover you are building? Well, look no further! Holley has created a full line of Billet Fuel Cell Caps and Billet Fill Caps. Holley caps are CNC machined from 6061-T6 billet aluminum and they feature a bright black anodize for great looks and corrosion protection. Each cap features a laser etched Holley Equipped logo so you know it is quality product. Holley Billet Fill Cap kits allow you to put a fill cap or inspection plug anywhere it is needed. 241-228 features an aluminum weld bung. All kits feature an easy to grip screw on cap with O-ring seal and a 1.38" diameter opening.


  • Kit allows for installation of a fill cap or inspection plug anywhere needed
  • Features aluminum weld bung
  • Easy to grip screw on cap with o-ring seal
  • 1.950" Outside Diameter of Weld Bung
  • 1.400" Inside Diameter of Weld Bung
  • 1.810" Diameter at Step of Weld Bung
  • 0.675" Overall Height of Weld Bung
  • 0.570" Height at Step of Weld Bung
  • Thread 1-1/2"-12


Emission Code5
Product TypeAccessory
Part Number241-228


This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

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