Bolt-On Fuel Cell Aluminum Fill Cap Bung
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Bolt-on Fuel Cell Bungs
Pro-werks Fill Cap Bungs are available separately without the cap. These bolt-on style aluminum bungs come in several types and sizes, 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!
Properly sized for the "radially squeezed" O-ring standard of the signature Pro-werks Easy Turn Fill Cap.
The selection of weld-able bungs is also available; including several different heights in your choice of Steel, Aluminum or Stainless steel materials.
Note: Welding should always be performed by a qualified welder.
Great caps. Great colors.
The right size matters.
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.
FAQs
Q: How much do I need to tighten a fill cap?
A: It is not necessary to bottom the fill cap into the bung−just adequately seat the O-ring. The radial squeeze action on the O-ring creates a positive seal and helps prevent the cap from coming loose.
Q: What should I use to lubricate the Buna O-ring?
A: Applied periodically, a light coating of Dielectric grease has proven to work well as an O-ring lubricant.
Q: Is Buna rubber compatible with my fluid?
A: Buna is a synthetic rubber compound suitable for use with most fluids. Buna components may need to be replaced by a material compatible with the specific chemistry of some fluids.
Q: How do I properly weld my bung?
A: Apply several small, equally spaced tacks and preheat before welding. Keep the weld small to minimize potential distortion or shrinkage.
Q: If my threads are tight after welding, how do I fix it?
A: 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.