Collection: Weld-On Fittings & Bungs - Speedflow & Proflow

Browse Speedflow and Proflow weld-on fittings and bungs for custom automotive fabrication. The range includes AN male bungs, female ORB and NPT bungs, sensor fittings, hose-barb weld fittings, radiator necks, filler cap assemblies and an EFI injector weld boss, with related plugs and caps.

Choosing a weld-on fitting

• Material: Match the fitting material to the component being fabricated and the intended welding process. Aluminium, steel and stainless steel options vary by product.
• Connection: Check the exact AN size, thread diameter and pitch, or hose-barb size required. Do not assume similar-looking threads are interchangeable.
• Sealing arrangement: Confirm the mating fitting, seat, O-ring or washer requirements in the individual product specifications.
• Application and clearance: Check dimensions, wall thickness, fitting orientation and space for the connected hose, sensor or cap.
• Compatibility: Verify the manufacturer's requirements for the fluid, pressure, temperature and installation location.

Have a suitably qualified fabricator assess material compatibility and installation requirements. Follow the manufacturer's instructions and arrange appropriate inspection and testing before use.

Weld bungs and fabrication components

• 990 Series Female ORB Weld Bungs
• 997 Series Female NPT Weld Bungs
• 999 Series AN Male Weld Bungs
• 999 Series Aluminium Male Hex Weld Bungs
• Filler Cap & Weld Bung Assemblies
• 989 Series Sensor Weld Fittings: check the specified sensor thread or probe connection, including M14 and M18 O2 sensor bungs and EGT fittings.

Related components

• Speedflow AN Fittings
• Speedflow Braided Hose
• AN to NPT Adapters
• Fuel Systems
• Engine Accessories