Products List
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Filler Cap and Bung
FCwB$24.25 - $29.75Filler Cap and Bung Filler Cap and bung these are most commonly used for oil tanks or any other fluid container such as an overflow tank that does not need to be vented. We make a vented version of these filler necks as well. 1.250 x 12 threaded bung... -
Filler Cap and Bung Vented
FCBV$29.00 - $34.50This is a vented version of our common Filler Cap and Bung. These caps use the same standard bung we have used for years. They have a small .040" hole for venting with a replaceable brass vent fitting installed on the inside to reduce liquid seepage... -
Brass Filler Cap and Bung
BFCB$44.75 - $47.75Brass Filler Cap and Bung This filler cap and bung are most commonly used for oil tanks or any other fluid containers, such as an overflow tank that does not need to be vented. We make a vented version of these filler necks as well. This kit... -
Brass Filler Cap with Tall Bung
BTFCB$49.50 - $50.50Solid brass filler cap with a tall weld in filler neck made of mild steel or aluminum. The brass filler cap in your choice of a vented or non vented version. The taller weld in filler bung in mild steel or aluminum can be cut down or used in it's full... -
Brass Vented / Filler Cap and Weld in Bung
BVF$47.00 - $50.00By popular demand we are now making a Brass version of our common Vented Filler Cap and Bung. These caps use the same standard bung we have used for years. They have a small .040" hole for venting with a replaceable brass vent fitting installed on the... -
Oil Tank Bung Kit
OTBK$32.50 - $38.50This kit includes all threaded fittings needed for proper function of an oil tank. This kit contains three 1/8 NPT fittings for your oil lines (feed, vent, and return) it also contains a threaded filler cap and bung. All weld in parts are available in... -
Aluminum Filler Cap with Tall bung
ATFC$26.75 - $33.25A slightly different taller version of our standard filler cap andweld in bung. These are a weld in filler neck made of mild steel and come with an aluminum filler cap in your choice of vented or non vented version. The taller weld in filler bung can be... -
Brass Gas Cap OEM HD Tank
BGCOEM$69.95 - $139.90This is our new brass gas cap for fitment on all HD models from 1986 on up to present. The top is made of solid brass and comes with the same O-ring and thread used by the factory. They feature a knurled outer edge for good looks and extra grip for...Qty in Cart: 0Price:$69.95 - $139.90Subtotal: -
Brass Oil / Filler Cap
BOFC$33.00By popular demand we are now making a Brass version of our common Filler Cap. These can be used for oil tanks or any other fluid container that requires a non vented cap. These caps use the same standard bung we have made for years the 1 1/4 x 12 thread... -
Brass Vented / Filler Cap
BVFC$37.00By popular demand we are now making a Brass Vented version of our common Filler Cap and Bung Can be used for gas tanks oil tanks or any other fluid container. These caps use the same standard bung we have used for years so if you want to upgrade to a... -
Weld in Filler Bung
FB$13.50 - $16.50These are our weld in filler bungs, used with all of our vented and non vented caps. 1 1/4" x 12 thread 1 3/4" flange OD 1 1/2" stepped down OD Available in Mild Steel, Aluminum, or Stainless Steel Sold each -
Tall Filler Bung
TFB$13.75 - $14.75This is a different version of our ever popular filler bungs, these weld filler bungs are taller than our standard flanged ones for those who would like to stand the filler neck off of your tank a little higher. They are the same 1 1/4" x 12 thread pitch... -
Replacement Filler cap O-ring
oring$0.39This is a replacement O-ring for all of our vented and non vented filler caps. Made from fuel and oil resistant rubber for a long service life. -sold each for $0.39 -
OEM Gas Tank Bung
OEMGTB$14.00This is an OEM style weld in gas tank bung, the same one used on all of the later Harley Davidson Tanks. Permits the use of factory or the vast variety of aftermarket replacement gas caps on the market. The bung is made of mild steel and has the threads... -
1/8" male NPT Vent Fitting
BVENT18$2.49This is a 1/8" male NPT fitting with a brass screen/filter. We commonly use these for our filler caps to provide a vent but cut down on the amount of fluid seapage from having a vented hole in a fluid container. They are oil and fuel resistant for a long...
Filler Caps – Secure, Leak-Proof Solutions for Custom Motorcycle Builds
Bung King’s filler caps and weld-in bungs are CNC-machined in the USA from high-quality steel, stainless steel, and aluminum, designed to provide secure, leak-proof seals for fuel tanks, oil tanks, and other custom fluid containers. These weld-on caps and bungs are perfect for custom motorcycles, choppers, and hot rod builds, ensuring a clean, professional finish while protecting your tank’s contents from leaks or contaminants.
Our filler caps are available in aluminum or brass, offering a range of options to suit your build’s aesthetic. The weld-in bungs come in steel, stainless steel, and aluminum, providing a strong, reliable base for secure tank mounting. Whether you're fabricating a custom fuel tank or upgrading an existing one, Bung King’s filler caps and bungs provide the durability, function, and style your project needs.
Key Features:
CNC-machined from steel, stainless steel, or aluminum for durability
Filler caps available in aluminum or brass for a range of finishes
Weld-in bungs for secure tank mounting, available in steel, stainless steel, and aluminum
Leak-proof design for secure sealing on custom fluid containers
Ideal for custom motorcycles, choppers, hot rods, and other custom builds
Weld-ready for easy installation and professional results
Designed and manufactured in the USA for top-notch quality and precision
When you need a reliable and stylish sealing solution for your custom tanks, Bung King filler caps and weld-in bungs offer the perfect combination of function, style, and durability.
