Weld-On Fittings & Bung Adapters

The Professional Choice for Custom Fabrication

When an off-the-shelf adapter won't cut it, our range of weld-on fittings and bungs provides the ultimate solution for custom fabrication. At AN Fittings NZ, we supply high-quality weld fittings designed to be integrated directly into your fuel tanks, oil sumps, radiators, and catch cans. Whether you are building a custom surge tank or modifying an aluminum radiator, our weld bungs ensure a professional, high-flow connection.

We stock a variety of sizes and materials to suit any fabrication project, ensuring that your custom-built components meet the same rigorous standards as the rest of your performance plumbing.

Precision Machined for Superior Weldability

Successful fabrication starts with the right materials. Our weld fittings are engineered to provide clean, strong welds with minimal contamination:

  • Aluminum Weld Bungs: CNC-machined from high-grade 6061-T6 aluminum, these are perfect for fuel cells, valve covers, and intercooler piping. They offer excellent thermal conductivity and weld consistency.

  • Stainless Steel & Steel Options: For high-heat or heavy-duty applications like exhaust sensors or steel oil pans, our steel bungs provide the durability and thread integrity required for extreme conditions.

  • AN Flare Profiles: Available in all standard sizes from -3AN to -20AN, featuring precision-machined 37° flare seats for a perfect seal with your hose ends.

  • NPT & Female Bungs: Beyond standard AN flares, we carry NPT female bungs for sensor mounting and drain plug applications.

Built for NZ Fabricators and Tuners

From weekend garage projects to professional motorsport workshops, our weld-on components are the industry standard across New Zealand. We understand that in custom fabrication, precision is everything—that’s why our bungs feature a stepped "lip" or shoulder where applicable, making them easier to seat and weld squarely.

Shop our range of weld-on fittings below and give your custom fabrication project the professional finish it deserves. Fast shipping available NZ-wide.