Earl's Performance Aluminum NPT Female Weld Boss Fittings

Earl's Performance Aluminum NPT Female Weld Boss Fittings deliver a professional-grade, permanent solution for adding leak-free threaded ports to custom plumbing installations. Precision-machined from 6061 lightweight bare aluminum, these weld-in bungs are engineered to be permanently welded into tanks, pans, housings, and tubing across a wide range of fuel, oil, coolant, and fluid transfer applications.

Key Features:

• 6061 aluminum construction for excellent corrosion resistance, strength, and reduced weight
• Precision-machined to exacting tolerances, meeting and exceeding minimum aerospace-grade material requirements
• Female NPT threads accept standard pipe fittings and adapters for versatile, flexible plumbing configurations
• Reduced base profile for easy fitment into drilled holes and consistent weld-in installation on tanks, pans, housings, and custom fabrications
• Ideal for oil tanks, fuel tanks, overflow tanks, and virtually any other fluid system application
• Made in the USA to Earl's industry-leading quality standards
• Part of the most complete weld bung and fitting line available for performance and custom applications
• Compatible with special adapter fittings within the Earl's lineup to meet specific racing industry requirements

These weld boss fittings serve as a natural foundation for any high-performance or custom fluid system build — whether fabricating race-ready components, modifying existing tanks, or adding threaded ports to a custom plumbing setup. Available in multiple NPT thread sizes to suit virtually any plumbing situation.

About Earl's Performance: Earl's Performance Plumbing brought aviation fluid transfer technology to the automotive performance market over five decades ago. Top funny car and open-wheel racing teams continue to rely on Earl's aerospace-inspired components, and this NPT Weld Boss line reflects that same legacy of precision engineering and uncompromising quality.