3' 4an Blue Line

The 3' 4AN Blue Line nitrous hose from Nitrous Oxide Systems is a dedicated fuel and oxidizer delivery line engineered for serious performance enthusiasts running wet nitrous oxide kits on street and track vehicles. This 36-inch braided stainless steel hose with PTFE inner liner connects your nitrous system's solenoid to the inlet manifold, fuel rail, or distribution block with precision 4 AN straight fittings on both ends. Whether you're tuning a bolt-on nitrous setup or integrating progressive nitrous control into a full engine build, this hose delivers the reliability and flow characteristics demanded by high-horsepower applications.

Constructed with braided stainless steel outer sheathing and PTFE (polytetrafluoroethylene) inner tubing, the 3' 4AN Blue Line resists corrosion, abrasion, and thermal degradation in engine bays where vibration and heat stress hoses daily. The -4 AN size delivers optimal flow rates for typical stage 1 and stage 2 nitrous kits without creating backpressure that reduces solenoid response time or system efficiency. Blue AN fittings provide easy visual identification within the engine bay and signal to technicians that this is a pressurized nitrous line, not a fuel or coolant circuit. The 4 AN straight-to-4 AN straight female configuration allows flexible routing around intake manifolds, carburetors, and fuel injector rails without requiring additional adapters.

Mechanics and tuners integrating Nitrous Oxide Systems kits will find the 3' 4AN Blue Line ideal for small-block and big-block V8 platforms, LS engines, and modern fuel-injected mills where space between the solenoid and manifold entry point runs 2 to 3 feet. The 36-inch length accommodates most stock and performance intake manifolds without excess hose drape that traps heat or creates installation complexity. Installation requires only wrench access to the 4 AN female port and compatible hose barb or fitting on the solenoid outlet; no specialized tools or adapters are needed. Check local circuit rules and tuning parameters when selecting your nitrous stage to ensure this hose's flow capacity aligns with your planned horsepower target.