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 All the parts you need to Fabricate your own custom oil tank for your custom motorcycle. This is a weld together kit for those who don't mind doing a little welding and grinding themselves and saving some money in... -
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$62.50Flanged Cap F' Bomb Oil Tank Kit 5" dia All the parts you need to Fabricate your own custom oil tank for your custom motorcycle. This is a weld together kit for those who don"t mind doing a little welding and grinding themselves and saving some... -
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 We have been selling these endcaps for years in our Pipe Bomb Oil Tank Kits and now you can purchase them seperately from the kit. These domed caps are stamped out of 14 gauge mild steel and their height is half of their diameter. ... -
Oil Tank Tubing 5" and 6"
OTtube$2.45Oil Tank Tubing by the Inch We have been selling this 5" and 6" mild steel tubing for years in our Pipe Bomb Oil Tank Kits and now you can purchase it separately from the kit. If you are looking to get some tubing for the shell of your oil tank but don't... -
Flat Round Oil Tank Endcaps
FROTEC$4.00Flat Round Oil Tank Endcaps If you have your own tubing but would like some perfect circles to cap it of with, these are for you. We stock a few different sizes. If you do not see a size you need, let us know and we can cut some out for you to your... -
Flanged Oil Tank Endcap
FOTEC$6.00Flanged Oil Tank Endcaps These are the endcaps used in our Flanged F Bomb Tank. They are made on our pullmax to fit either a 5" or 6" dia oil tank. These are made from 16 ga mild steel with the extra body line to give your custom built oil tank some... -
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 making a custom oil tank you may choose to have all of your oil line fittings at the bottom of the tank instead of having the vent and return lines at the top of the tank. These tubes can be welded to the top of the npt bung before the npt bungs are... -
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$14.00These are another version of our rubber mounting tabs. We wanted to add a little more style to our original tabs for those who are using them in a more visible location. The weld on mounting tabs are CNC cut out of 1/4" thick mild steel and use the... -
Rubber Tank Mount Singles
rtms$14.00These mounts are most commonly used for mounting gas tanks and oil tanks. The rubber isolaters help reduce the risk of cracks developing in your fluid container. They use the common flat side tank mount rubbers that can be found at any Harley dealer. The... -
Hourglass Rubber Mount Long
HGRMSL$14.00These are another version of our rubber mounting tabs, we added to add a little more style to our original tabs for those who are using them in a more visable location. The weld on mounting tabs are CNC cut out of 1/4" thick mild steel and use the... -
Bolt on Rubber Mount Tab
RTMBO$16.00We have used these rubber isolaters for years for mounting of gas tanks and oil tanks, the rubber isolators help reduce the vibration felt by your fluid container and thus extend the life of the tank from cracking. Most of our tabs in the past have... -
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.
