#4 Black Nylon Race Hose 20ft

The #4 Black Nylon Race Hose 20ft is purpose-built for high-performance fuel and fluid systems in competition vehicles, street rods, and serious engine builds. Whether you're running a fuel system upgrade, intercooler lines, or transmission cooler plumbing, this race-grade hose delivers the reliability demanded by motorsports applications. Fragola's reputation in the racing community stems from uncompromising material quality and burst-pressure engineering that exceeds DOT standards—critical when you're pushing an engine to its limits on track or strip.

Constructed from reinforced nylon with a smooth inner bore, this #4 (1/4-inch nominal ID) hose resists abrasion, vibration, and heat degradation that typically claim standard rubber lines in modified engine bays. The black outer cover provides UV and ozone resistance, extending service life in exposed underhood environments. At 20 feet, you have sufficient length for complete fuel system routing, coolant bypass circuits, or multi-component fluid transfers without mid-run splicing—a critical advantage when consistency and pressure integrity are non-negotiable. The nylon construction allows tighter bends than traditional rubber in tight engine compartments, simplifying installation around headers, superchargers, and other modifications.

Race builders, carbureted and fuel-injected engine builders, and bracket racers rely on Fragola hose for consistency when every thousandth of a second counts. This hose pairs seamlessly with Fragola -4 AN fittings and adapters, making it an essential upgrade component for vintage muscle cars receiving modern fuel injection, LS swaps, and turbo installations. Proper sizing—confirmed by checking your current fitting thread or calling tech support—ensures leak-free connections. Install with hose clamps rated for your pressure range, and always route away from exhaust manifolds and moving pulleys to maximize hose longevity and system safety.