Products List
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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... -
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 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,... -
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 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$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... -
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 -
Tall Filler Bung
TFB$13.75 - $14.75Tall Weld-In Filler Bung – 1.25"-12 Thread, Mild Steel This tall weld-in filler bung is a modified version of our popular flanged filler bungs, designed for builders who want a bit more height on their filler neck. With an overall height of 1.25",... -
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$14.00OEM Style Weld-In Gas Tank Bung – Fits Most Harley Models 1986–Current This OEM style weld-in gas tank bung is the same style used on later Harley-Davidson tanks, making it the perfect solution for custom tank builds or repairs. Designed to... -
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 Tanks
Bung King’s filler caps are the perfect solution for sealing custom fuel tanks, oil tanks, and other fluid containers. CNC-machined in the USA from high-quality steel, stainless steel, aluminum, and brass, these filler caps ensure a secure, leak-proof connection that keeps your tank’s contents safe and secure.
Ideal for custom motorcycles, choppers, and hot rods, our filler caps are available in a range of sizes and finishes, including stainless steel, aluminum, and brass. Whether you're building a new tank from scratch or upgrading an existing one, these caps offer superior sealing and a clean, professional finish for your custom build.
Key Features:
CNC-machined from steel, stainless steel, aluminum, and brass for durability and precision
Leak-proof design ensures a secure, tight seal for custom tanks
Available in various sizes to fit different tank applications
Ideal for custom motorcycles, choppers, hot rods, and other custom fluid containers
Weld-ready for easy installation and professional results
Manufactured in the USA for top-quality craftsmanship and reliability
When it comes to sealing your custom fuel or oil tanks, Bung King filler caps offer the perfect combination of performance, durability, and style.
