NOS Pipe Fitting Tube Nuts for Nitrous Oxide & Fuel Systems

NOS (Nitrous Oxide Systems) Pipe Fitting Tube Nuts are precision-engineered hardware components designed to create secure, leak-free connections in nitrous oxide delivery and high-performance fuel system plumbing. These tube nuts work in conjunction with compatible tube sleeves to transition from hard line tubing to AN fittings, forming a reliable mechanical seal built to handle the extreme pressures found in nitrous and performance fuel applications.

Designed for use with a 37-degree flaring tool, NOS tube nuts mate properly with flared hard line ends to produce consistent, repeatable seals. NOS systems are engineered around the 37° AN fitting standard — it is critical to avoid mixing 37° AN and 45° SAE fittings to maintain system integrity and prevent potential leaks.

Key Features:

• Precision Machined: Engineered for accurate thread engagement and consistent sealing performance across nitrous oxide and fuel system installations
• High-Pressure Rated: Built to withstand the elevated operating pressures common in nitrous systems, where pressures routinely exceed 1,000 psi
• AN Standard Compatible: Designed for use with 37° AN flare fittings and compatible NOS hard line tubing for proper system integrity
• Corrosion Resistant: Constructed for lasting durability and resistance to harsh underhood and underbody environments
• Broad Application Range: Suitable for nitrous oxide systems across a wide variety of platforms — from street performance builds to dedicated race vehicles
• Direct Replacement Ready: Ideal for new builds, system expansions, or replacing worn hardware in existing NOS installations

Nitrous Oxide Systems (NOS) has powered more racers than any other nitrous brand, delivering industry-leading performance and reliability across everything from stock street engines to dedicated race vehicles. As a Holley Performance brand backed by decades of nitrous expertise, NOS tube nuts reflect the same commitment to precision and quality that professionals and enthusiasts worldwide depend on.