Nitrous Oxide Fitting

What Are Nitrous Oxide Fittings?

Nitrous oxide fittings are the critical plumbing hardware that connect every component in a nitrous injection system — from the high-pressure bottle to the solenoids, distribution blocks, and ultimately the engine's intake. Without properly matched fittings, a nitrous system simply cannot function safely or effectively. These fittings serve as the backbone of the entire plumbing circuit, maintaining seal integrity and consistent flow under the demanding pressures that nitrous oxide systems generate.

A nitrous oxide system increases engine power output by allowing fuel to burn at a higher-than-normal rate, thanks to the elevated oxygen concentration released when N2O decomposes. Because the gas is stored as a pressurized liquid, every connection point in the plumbing circuit must be rated for these high-pressure conditions. Even a minor leak at a fitting can compromise performance — or worse, create a safety hazard.

Types of Nitrous Oxide Fittings

The nitrous fittings category spans a surprisingly wide range of hardware. Common fitting types include:

• AN (Army-Navy) fittings — Straight, 90-degree, and tee configurations in sizes such as -3AN, -4AN, and -6AN, used for braided stainless steel hose connections
• NPT (National Pipe Thread) fittings — Standard tapered pipe thread fittings for solenoid inlets, gauge ports, and distribution blocks
• Adapter fittings — Allow conversion between AN and NPT thread standards, or between different line sizes, to bridge components from different manufacturers
• Tee and Y-fittings — Split nitrous or fuel flow to multiple solenoids or nozzles in staged or direct-port systems
• Bulkhead fittings — Permit lines to pass cleanly through firewalls or chassis panels
• Weld-in bungs and tube fittings — Used for custom hardline installations

When selecting nitrous oxide fittings, it is essential to consider compatibility with your nitrous system, the thread type required (AN or NPT), and the material construction for durability under high-pressure operation. Fittings and lines should also be appropriately sized and rated for the horsepower levels and flow rates of your specific nitrous setup. All lines connected to these fittings should be steel or braided stainless steel to withstand high nitrous pressures.

Top Brands for Nitrous Oxide Fittings

NOS (Nitrous Oxide Systems) is the brand that essentially defined the industry. Born in the late 1970s, NOS quickly became known for producing easy-to-install components made from the highest quality materials available. Their fitting lineup includes a comprehensive range of AN hose assemblies, adapter fittings, tee fittings, tube nuts, and weld-in bungs — essentially everything needed to plumb a complete system from bottle to nozzle.

Russell Performance brings decades of expertise in high-performance fluid handling to the nitrous fittings category. Russell is widely respected for precision-machined AN fittings and braided stainless hose assemblies that hold up under extreme pressure — a natural fit for the demanding environment of a nitrous oxide system.

Nitrous Express (NX) was founded by a racer frustrated with the limitations of existing nitrous technology, and that performance-first philosophy carries through to every component they make. In pursuit of perfect nitrous and fuel delivery, Nitrous Express CNC-machines its own high-efficiency, low-turbulence valves, jets, and solenoids — and their fittings reflect that same obsession with flow optimization and eliminating turbulence points that can dilute the nitrous charge.