Nitrous Oxide Nozzle Bung

What Is a Nitrous Oxide Nozzle Bung?

When building a direct port nitrous oxide injection system, every component in the chain matters — and the nozzle bung is where it all begins. A nitrous oxide nozzle bung is a small but critical weld-in fitting that provides a precisely threaded mounting point in your intake manifold or intake runner for a nitrous nozzle. Without it, there's no reliable, leak-free way to anchor a nozzle in place and deliver nitrous oxide accurately to each cylinder.

These fittings are typically machined from aluminum or brass and are designed to be welded directly into the intake manifold wall. Once welded, the pre-tapped threads accept a 1/16 in. NPT nozzle fitting, allowing the builder to install, remove, or swap nozzles cleanly without damaging the manifold itself. The through-hole design ensures unobstructed flow, while the secure weld-in mounting eliminates the vibration and leak concerns that can arise from less permanent solutions.

Why Nozzle Bungs Matter for Direct Port Nitrous Systems

Nitrous oxide nozzle bungs are specifically associated with direct port nitrous setups — the most powerful and precise method of nitrous injection available. Direct port systems route individual nozzles to each cylinder, rather than spraying nitrous through a single throttle body or plate. This cylinder-by-cylinder approach allows tuners to achieve far more even nitrous distribution across the engine, which is especially critical at high power levels.

Setting up a manifold for a direct port nitrous system typically requires time, skill, and welding equipment. The nozzle bung simplifies that process by giving fabricators a ready-made, standardized insert to weld in place — eliminating the need to carefully tap raw manifold material. Once installed, the bung's pre-cut NPT threads make nozzle installation straightforward and repeatable.

When shopping for nozzle bungs, keep these factors in mind:

• Material: 6061 aluminum is common for weight savings and corrosion resistance; brass offers excellent thread durability
• Thread size: Most nozzle bungs use 1/16 in. NPT threads — confirm compatibility with your chosen nozzles before purchasing
• Through-hole diameter: Ensure the through-hole is sized correctly to avoid flow restriction
• Package quantity: Direct port systems need one bung per cylinder, so multi-packs are often the practical choice
• Weld compatibility: Match bung material to your manifold material for the cleanest, strongest weld

Top Brands for Nitrous Oxide Nozzle Bungs

NOS (Nitrous Oxide Systems) is the definitive name in nitrous components, and their nozzle bungs reflect decades of development alongside professional racers and engine builders. NOS has been the leader in innovative, quality nitrous systems and components for over 35 years, and their machined weld-in fittings are precision-crafted to work seamlessly with the brand's full ecosystem of nozzles and direct port hardware.