Products List
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Stepped Blind tank bungs
SBTB$4.25Stepped Blind Tank Bungs – 1018 Mild Steel These stepped blind threaded bungs—also known as top hat bungs—are ideal for welding into gas tanks, oil tanks, or any steel fluid container. Precision-machined from 1018 cold rolled mild... -
Gas Tank Kit
GTbk$10.00This gas tank kit gives you the peices needed to relocate your petcock and add a crossover. includes: Two 1/8" NPT bungs for crossovers and one 3/8" npt for a petcock -
Late HD Style 22mm Petcock Bung
22mmPK$9.00 - $17.5022mm Petcock Weld-In Bungs – 1018 Mild Steel (Short & Long Options) These 22mm weld-in petcock bungs are machined from solid 1018 cold rolled mild steel and tapped to accept standard 22mm x 1.0 thread motorcycle petcocks—perfect for... -
Steel NPT Bungs
NPT 83$3.00 - $5.501018 Mild Steel NPT Weld-In Bungs – Multiple Sizes Available These NPT weld-in bungs are precision-machined from solid 1018 cold rolled mild steel bar stock, then drilled and tapped to National Pipe Thread (NPT) standards for secure, leak-free... -
Stainless Stepped Blind Tank Bungs
SBTB-SS$4.95Stainless Steel Stepped Blind Tank Bungs – Top Hat Style for Fluid Containers These stainless steel stepped blind bungs—also known as top hat bungs—are perfect for fabricating or modifying gas tanks, oil tanks, or any stainless fluid... -
Stainless Stepped NPT bungs
SNPT-SS$4.95 - $11.95Stainless Steel NPT Weld-In Bungs – Multiple Sizes Available Our premium 300 series stainless steel NPT threaded weld-in bungs are precision-machined from solid round stock and tapped to your specified NPT thread size. Designed for custom... -
Filler Cap and Bung Vented
FCBV$31.75 - $36.50Vented Filler Cap & Bung Kit – 1.25"-12 Thread, Compact Design This vented filler cap and bung kit is a compact, functional solution for gas tanks, oil tanks, or any fluid container that requires internal venting. Built around our trusted,... -
Brass Filler Cap with Tall Bung
BTFCB$49.50 - $57.00Brass Filler Cap with Tall Weld-In Filler Neck – Vented or Non-Vented Add classic style and versatility to your custom build with this Brass Filler Cap and Tall Weld-In Filler Neck. Ideal for oil tanks, gas tanks, or any steel or aluminum fluid... -
Brass Vented / Filler Cap and Weld in Bung
BVF$52.00 - $55.00Brass Vented Filler Cap & Bung Kit – 1.25"-12 Thread Back by popular demand, we’re now offering a vented filler cap and bung kit featuring a solid brass cap. Built on the same trusted platform as our original design, this version combines... -
Aluminum Filler Cap with Tall bung
ATFC$30.75 - $38.50Tall Weld-In Filler Neck with Aluminum Cap – Vented or Non-Vented This tall weld-in filler neck and aluminum cap kit offers added height and versatility over our standard filler bung setup. Designed for custom applications like oil tanks, gas... -
Brass Gas Cap OEM HD Tank
BGCOEM$69.95 - $139.90Brass Gas Cap – Fits Harley-Davidson Models from 1986 to Present Give your Harley-Davidson a custom look with our precision-crafted Brass Gas Cap. Designed to fit all HD models from 1986 to the present, this cap uses the OEM-style thread and O-ring... -
Brass Vented / Filler Cap
BVFC$39.00By 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... -
1/4" BSP Bung
BSP14$8.00Our 1/4" BSPP Weld-On Bung is designed for custom motorcycle and fabrication projects requiring British Standard Pipe Thread Parallel fittings. This bung is commonly used on earlier British gas tanks and petcocks, offering a secure and reliable mounting... -
Weld in Filler Bung
FB$14.50 - $17.50These 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 -
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 -
Hourglass Rubber Tank Mount Short
HRTMSS$14.00Hourglass Rubber Mounting Tabs – Short Version, Weld-On Vibration Isolator Kit These Hourglass Rubber Mounting Tabs (Short Version) are a compact and stylish solution for securely mounting gas tanks, oil tanks, and other fluid containers on your... -
Replacement Rubber Isolator
RRISO$2.95Replacement Rubber Tank Mount Isolator – 5/16" I.D. Need a replacement for the rubber isolators used in our tank mounting kits? These Replacement Rubber Tank Mount... -
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... -
Rubber Tank Mount Singles
rtms$14.00Rubber Mounting Tabs with Isolators – Universal Gas & Oil Tank Mount Kit Keep your custom motorcycle’s gas or oil tank securely mounted while protecting it from vibration damage with our Rubber Mounting Tabs with Isolators. Designed for... -
Rubber Tank Mount Kit
RTMK$24.00 - $41.00Rubber Tank Mount Kit – With Optional Weld-In Bungs Our Rubber Tank Mount Kit is a proven solution for securely mounting custom gas tanks and oil tanks while minimizing vibration. The included rubber isolators reduce stress on your tank, helping to... -
Hourglass Rubber Mount Long
HGRMSL$14.00Hourglass Rubber Mounting Tabs – Long Version These Hourglass Rubber Mounting Tabs (Long Version) are designed for custom motorcycle and Harley-Davidson® builders who want strength, style, and vibration isolation in one clean package. Made for... -
Bolt on Rubber Mount Tab
RTMBO$16.00Bolt-On Rubber Mounting Tabs with Isolators – Vibration Reducing Tank Mounts These bolt-on rubber mounting tabs are designed for builders and riders who want the benefits of vibration isolation without the hassle of welding. Traditionally, rubber... -
Aluminum Stepped Blind Tank Bungs
ASBTB$4.506061 Aluminum Blind Threaded Stepped Bung – For Fuel, Oil & Catch Tanks These weld-in aluminum blind threaded bungs—also known as top hat bungs—are ideal for custom fabrication of aluminum gas tanks, oil tanks, coolant catch tanks,... -
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... -
20mm Petcock Bung
20MMPK$9.0020mm Petcock Weld-In Bung – 1018 Mild Steel (Triumph, BMW, Euro Style) This 20mm petcock bung is precision-machined from solid 1018 cold rolled mild steel and features a 20mm x 1.0 male thread, making it an ideal fit for Triumph, BMW and other...
Gas Tank Components – Build and Modify Custom Tanks
At Bung King, we specialize in gas tank components designed for custom motorcycles and choppers. Whether you’re building a tank from scratch or modifying an existing one, our high-quality parts provide the perfect solutions for your custom fuel tank projects.
We offer a wide range of gas tank bungs, filler caps, mounting hardware, and rubber mounting kits to help you create or modify the perfect fuel tank for your custom bike. All components are made from durable steel, stainless steel, and aluminum, ensuring top-notch quality and precision for your build.
Key Features:
Gas tank bungs and filler caps for secure fuel tank connections
Rubber mounting kits for easy, secure installation of your custom gas tank
Made from high-quality steel, stainless steel, and aluminum for durability
Components designed for building and modifying custom motorcycle tanks
Ideal for custom choppers, cruisers, and hot rods
Manufactured in the USA with precision and craftsmanship
Whether you're modifying an existing tank or building a custom one, Bung King’s gas tank components ensure your build is strong, secure, and ready for the road.
