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.
These bungs utilize the popular non-vented Easy Turn Fill Caps that are available variety of Pro-Werks Brilliance anodized colors or beautifully Micro-polished aluminum finish - 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.
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 !
Both the Cap and Bung are precision CNC machined from billet aluminum, right here in the USA.
Finish Your Tank
We also offer a full line of weld-in plumbing bungs to complete your tank project.
Click the images below to view all the options.
Q:
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How much do I need to tighten a fill cap?
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A:
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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:
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What should I use to lubricate the Buna O-ring?
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A:
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Applied periodically, a light coating of Dielectric grease has proven to work well as an O-ring lubricant.
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Q:
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Is Buna rubber compatible with my fluid?
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A:
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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. |
Outside Grip Diameter:
3.200 in.
Height:
0.312 in.
Thread:
2-1/4-10
Height:
0.625 in.
Inside Grip Diameter:
2.750 in.
Diameter:
2.0 in.
Threads:
2-1/4-10
Fits 2-3/4 Fill Cap
Outside Diameter:
3.75 in.
Diameter Holes:
0.188 in.
(4 Places 3.25 in. Diameter Bolt Circle)
Height:
0.688 in.
Height:
1.75 in.