4AN 90Deg Male Adapter to 1/4in NPT Male Blue

The 4AN 90Deg Male Adapter to 1/4in NPT Male Blue from REDHORSE PERFORMANCE is a precision hydraulic and fuel line fitting engineered for high-performance automotive, marine, and industrial applications. This 90-degree adapter bridges two different connection standards—4 AN (dash-4) and 1/4 inch NPT (National Pipe Thread)—allowing technicians and builders to integrate components that would otherwise be incompatible. Whether you're designing a custom fuel system, upgrading brake lines, or assembling a turbo cooling circuit, this adapter provides a reliable transition between threaded and flare-style connections.

Constructed from aluminum and finished in blue anodized coating, this fitting combines lightweight durability with corrosion resistance—critical for systems exposed to fuel, coolant, or salt spray environments. The 90-degree angle geometry redirects flow efficiently while maintaining a compact footprint in tight engine bays or chassis layouts. Both male connections ensure secure attachment: the 4 AN male end accepts industry-standard AN hose or hard-line fittings, while the 1/4 inch NPT male threads directly into female NPT ports on manifolds, adapters, or aftermarket components. Precise dimensional tolerances ensure leak-free operation under pressure, protecting fuel and coolant integrity.

This adapter is ideal for custom fuel system builders, hot rod fabricators, and engineers consolidating legacy NPT-threaded components with modern AN quick-disconnect plumbing. It pairs seamlessly with fuel rails, pressure regulators, distribution blocks, and turbocharger intercooler circuits that mix old and new inlet/outlet specifications. Installation is straightforward: thread the NPT end into the target port using appropriate thread sealant, then attach AN hose or fittings to the opposite end. Compact dimensions (2.8 x 1.1 x 3.85 inches) and minimal weight (0.06 lbs) make it an invisible but essential system component for any performance platform.