4an 20ft. Blue (Hose)

The NITROUS OXIDE SYSTEMS 4AN 20ft Blue Nitrous Hose is a purpose-built braided stainless steel assembly engineered for high-performance nitrous oxide delivery systems. This 20-foot hose runs from the nitrous bottle to the intake manifold distribution block and features reinforced braiding with PTFE (polytetrafluoroethylene) inner lining to handle the extreme pressures and cold temperatures characteristic of nitrous oxide transfer without degradation or permeability.

The hose terminates with 4 AN (5/16-inch) straight fittings on both ends—4 AN male to 4 AN female—providing reliable connections to compatible nitrous system components. The blue anodized aluminum fittings not only deliver a clean aesthetic but also signal the hose type to technicians during system assembly and maintenance. At 1.26 lbs, this hose assembly is compact enough for under-hood installation in tight engine compartments while maintaining the length necessary for routing from rear-mounted bottles to front-mounted fuel delivery systems without kinks or routing stress.

Buyers installing or upgrading nitrous systems will appreciate the verified compatibility with NITROUS OXIDE SYSTEMS kits and the confidence that comes from OEM-specification components. The stainless steel construction and PTFE lining resist corrosion and maintain system integrity across multiple heat cycles. This hose is essential for anyone tuning a drag vehicle, street car, or performance truck where controlled nitrous oxide injection demands reliability and precision plumbing.

Nitrous systems require every connection point to be airtight and pressure-rated; any hose failure or leak directly compromises boost consistency and engine safety. The NOS15305 addresses that demand with braided reinforcement and factory-proven AN fitting geometry, making it the standard choice for serious power adders.