21in #4 Line -4 Str/ 1/8in NPT

The 21in #4 Line -4 Str/ 1/8in NPT from Allstar Performance is a precision-engineered braided hydraulic hose assembly designed for high-pressure fluid transfer in performance automotive applications. This component is ideal for mechanics and engine builders who demand reliability in fuel, coolant, power steering, and brake system modifications. Whether upgrading a carbureted engine fuel system or routing power steering fluid in a chassis swap, this hose provides the durability and flow capacity required for serious modifications.

Constructed with braided reinforcement, the 21-inch hose manages extreme pressure spikes without failure, a critical requirement in turbocharged, supercharged, and high-compression engine builds. The -4 AN/JIC size designation indicates a 3/8-inch nominal bore, making it suitable for applications requiring moderate to high flow rates without excessive pressure drop. Straight fittings (-4 Str) combined with 1/8-inch NPT ports allow direct integration with adapters, manifolds, and block ports common in custom fuel rails, transmission coolers, and remote oil filtration systems.

This hose assembly is essential for street rod builders, drag racers, and engine swappers transitioning between different engine platforms or fuel system architectures. The braided cover protects against abrasion and UV degradation, extending service life across engine bays subject to heat cycling and vibration. With its robust construction and versatile applications, this hose is a reliable choice for any high-performance automotive project.