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... -
Filler Cap and Bung
FCwB$25.75 - $29.75Non-Vented Filler Cap & Bung Kit – 1.25"-12 Thread, Compact Design The non-vented filler cap and bung kit is a compact and clean solution for gas tanks, oil tanks, and fluid reservoirs where external venting is preferred or required. Using our... -
"Pipe Bomb" Oil Tank Kit 5" Dia
PBOTK5$68.00 - $91.00Pipe Bomb Oil Tank Kit – 5" Diameter, DIY Weld-Together Oil Tank Build your own custom motorcycle oil tank with our Pipe Bomb Oil Tank Kit – 5" Diameter. This DIY weld-together kit includes everything you need to fabricate a fully functional... -
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... -
F' Bomb Oil Tank Kit 5"
FBOTK5$55.00F' Bomb Oil Tank Kit – DIY Custom Motorcycle Fabrication Kit Build your own custom oil tank with the F’ Bomb Oil Tank Kit, designed for fabricators and riders who want a one-of-a-kind look for their motorcycle. This weld-together kit gives... -
Brass Filler Cap and Bung
BFCB$44.75 - $47.75Brass Filler Cap & Weld-In Bung – For Oil or Fluid Tanks Upgrade your custom build with this premium Brass Filler Cap and Bung Kit, ideal for use on oil tanks, overflow reservoirs, or any non-vented fluid container. This setup provides a clean,... -
"Pipe Bomb" Oil Tank Kit 6" Dia
PBOTK6$75.00 - $98.00Pipe Bomb Oil Tank Kit – 6" Diameter, DIY Weld-Together Oil Tank Build your own custom motorcycle oil tank with our Pipe Bomb Oil Tank Kit – 6" Diameter. This DIY weld-together kit includes everything you need to fabricate a fully functional... -
F' Bomb Flanged Cap Oil Tank 5" dia
FBOTC5$62.50F' Bomb Oil Tank Kit with Flanged End Caps – Custom Motorcycle Fabrication Kit Take your custom build to the next level with the F’ Bomb Oil Tank Kit featuring flanged end caps. Designed for fabricators and riders who want both function and... -
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... -
Oil Tank Bung Kit
OTBK$32.50 - $38.50Oil Tank Filler Cap & Bung Kit with (3) 1/8" NPT Bungs – Complete Weld-In Kit Build your custom oil tank the right way with this all-in-one weld-in bung kit. Designed for both performance and clean looks, this kit provides every threaded... -
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... -
Domed Oil Tank Endcaps
OTEC$16.50 - $20.50Domed Oil Tank Endcaps – 5" & 6" Steel End Caps for Custom Oil Tanks Our Domed Oil Tank Endcaps are the same high-quality end caps we’ve been using for years in our popular Pipe Bomb Oil Tank Kits, now available separately for your custom... -
Oil Tank Tubing 5" and 6"
OTtube$2.45Oil Tank Tubing by the Inch – 5" & 6" Mild Steel Build your own custom oil tank with our high-quality mild steel tubing, now available by the inch. This is the same 14-gauge tubing we use in our popular Pipe Bomb Oil Tank Kits, offered... -
Flat Round Oil Tank Endcaps
FROTEC$4.00Flat Round Oil Tank Endcaps – 5" & 6" Mild Steel Build your own custom oil tank or reservoir with our Flat Round Oil Tank Endcaps, designed to provide a precise, clean finish for your fabrication project. Made from durable 14-gauge mild steel,... -
Flanged Oil Tank Endcap
FOTEC$6.00Upgrade your custom oil tank build with our Flanged Oil Tank Endcaps, the same style we use in our popular Flanged F-Bomb Oil Tank Kits. Each cap is precision-formed in our custom die plate, after being cut on our CNC laser to ensure a perfect fit for 5"... -
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... -
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 -
Stainless NPT Bungs
NPTss$3.75 - $5.50Stainless Steel NPT Weld-In Bungs – Precision Machined These stainless steel NPT weld-in bungs are machined from solid stainless steel bar stock, then drilled and tapped to National Pipe Thread (NPT) specifications for a clean, reliable fit... -
Triumph Oil Tank Feed Bung
TOFB$8.00Triumph Oil Feed Bung – Mild Steel or Aluminum Weld-In Bung Our Triumph Oil Feed Bung is designed specifically for classic Triumph motorcycle builders looking for a clean, factory-style solution. Each bung is precision-machined and tapped to accept... -
Internal Oil tank Tubes
IOL$7.50When building a custom oil tank, many fabricators prefer to place all oil line fittings at the bottom of the tank for a cleaner look and easier plumbing. These weld-on vent and return tubes are designed to be welded directly to the top of an NPT bung... -
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... -
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... -
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,...
Oil Tank Components – Parts for Custom Oil Tank Fabrication and Mounting
Bung King offers a full selection of oil tank components designed for fabricators and custom motorcycle builders. Whether you're modifying an existing oil tank or building one from scratch, we provide the essential parts you need, including weld-in oil bungs, mounting brackets, and rubber mounting kits.
All of our components are CNC-machined in the USA using high-quality steel, stainless steel, and aluminum for superior durability and fit. These parts are perfect for use on choppers, bobbers, Harleys, and other custom motorcycles where secure, leak-resistant oil tank setup is required.
Key Features:
Precision-machined oil tank bungs in multiple thread sizes
Rubber mounting kits and hardware for easy, secure installation
Available in steel, stainless steel, and aluminum materials
Ideal for custom motorcycle oil tank fabrication or modification
Made in the USA with a focus on quality and performance
Compatible with a wide range of Harley and custom bike projects
Build or upgrade your oil tank setup with Bung King’s premium components—trusted by custom builders for strength, precision, and quality.
