48in #4 Line -4 Str/ 1/8in NPT

The 48in #4 Line -4 Str/ 1/8in NPT by ALLSTAR PERFORMANCE is a precision-engineered brake hose assembly designed for serious automotive builders and high-performance enthusiasts who demand reliability under demanding conditions. This 48-inch hose serves as a critical hydraulic line in custom brake systems, fuel systems, and transmission cooler applications where AN-fitting standards are non-negotiable. Built for vehicles undergoing significant modification—from street rods and race cars to custom trucks—this hose delivers the durability and flow characteristics that discerning mechanics require when upgrading from factory rubber lines.

Constructed with braided stainless steel exterior and PTFE inner lining, the 48in #4 Line -4 Str/ 1/8in NPT hose combines corrosion resistance with superior fluid compatibility. The -4 AN (AN4) designation indicates a 1/4-inch inner diameter, suitable for moderate to high-flow applications without excessive pressure drop. The 4 AN straight female fitting mates seamlessly with standard AN bulkhead adapters, while the 1/8-inch NPT straight male end threads directly into engine blocks, transmission pans, or aftermarket manifolds. PTFE lining prevents swelling and degradation from aggressive fuels, transmission fluid, and brake fluid, extending hose life in chemically demanding environments that would destroy conventional rubber hose in months.

This 48-inch length is ideal for routing through engine bays with complex modifications, custom fuel cell installations, and remote cooler setups where standard pre-bent hoses fall short. Professional builders and weekend fabricators alike choose Allstar Performance hose for its consistent quality and availability across the custom automotive community. Installation requires basic hose-end tooling knowledge—tightening AN fittings with appropriate wrenches ensures leak-free performance without over-torquing, which can strip fine NPT threads. Whether upgrading cooling systems, fuel delivery, or hydraulic brake circuits, this hose delivers the precision fit and longevity that separates competent builds from unreliable improvisation.