Collection: 990 Series Female ORB Weld Bungs - Aluminium

990 Series Female ORB Weld Bungs - Aluminium O-Ring Boss Fittings

Professional-grade aluminium female O-ring boss (ORB) weld bungs for custom oil coolers, fuel systems, and hydraulic applications. The Speedflow 990 Series provides leak-free ORB connections for high-pressure fluid systems.

📋 Weld Bung Installation Guide

→ Download our complete weld bung installation guide

Before you weld bungs into your tank, pan, or manifold, download our comprehensive guide featuring:

• ✅ Hole sizing chart - Exact hole sizes for all ORB bung sizes
• ✅ TIG welding settings - Aluminium-specific amperage and techniques
• ✅ Safety procedures - Critical fuel tank welding safety
• ✅ Step-by-step installation - Professional welding technique
• ✅ Troubleshooting guide - Fix common welding issues
• ✅ Printable workshop reference - Keep it handy during fabrication

→ View the full installation guide here

What Are ORB Weld Bungs?

O-ring boss (ORB) weld bungs feature internal straight threads with an O-ring groove, creating a superior seal compared to tapered NPT threads. You weld these bungs into tanks, pans, or manifolds, then install male ORB fittings with an O-ring for a leak-proof connection. Perfect for high-pressure applications like oil coolers, hydraulic systems, and fuel rails.

990 Series Applications

• Oil cooler installations - Weld into oil pans or remote cooler tanks for secure connections
• Fuel rails - High-pressure fuel system connections for EFI applications
• Hydraulic systems - Brake systems, power steering, and hydraulic clutches
• Turbo oil feed/drain - Reliable connections for turbocharger oil systems
• Transmission coolers - Leak-free cooler line connections
• Custom manifolds - Professional plumbing for intake or exhaust manifolds

Why Choose ORB Over NPT?

• Better sealing - O-ring provides superior leak prevention vs tapered threads
• Reusable - Can be assembled/disassembled multiple times without degradation
• No thread sealant needed - O-ring does all the sealing work
• Consistent torque - Straight threads allow precise torque specifications
• High-pressure rated - Ideal for fuel injection and hydraulic applications

Features & Specifications

• CNC machined from 6061-T6 aluminium
• Anodized finish for corrosion resistance
• Female ORB threads with O-ring groove
• Multiple sizes available (-4 to -16 ORB)
• Designed for TIG welding to aluminium
• Precision machined for perfect O-ring sealing

Installation Guide

1. Drill appropriate size hole in tank or manifold
2. Clean area thoroughly
3. Position weld bung and tack weld
4. Complete TIG weld around circumference
5. Install male ORB fitting with new O-ring
6. Torque to specification (no thread sealant needed)

Shop Related Weld Bungs:

• 999 Series male AN weld bungs - For AN hose connections
• 989 Series weld bungs - Universal threaded bungs

Complete Your System:

• Male ORB to AN adapters - Connect ORB bungs to AN hose
• Oil system components - Coolers, filters, and accessories
• Fuel system parts - High-pressure fuel components

Australian Stock - Perth Dispatch