4an Male to 4an Male w/1/8npt Hex

The 4AN Male to 4AN Male with 1/8 NPT Hex fitting from REDHORSE PERFORMANCE is a precision hydraulic adapter designed for custom fuel, coolant, and brake line systems in modified vehicles. This fitting bridges two 4AN hose ports while incorporating a 1/8-inch NPT hexagonal port, allowing simultaneous fluid transfer and auxiliary gauge or sensor integration without requiring bulky manifold blocks. Whether you're building a custom fuel delivery system on a track car, upgrading coolant flow in a high-performance engine bay, or integrating pressure monitoring into a race-spec braking setup, this adapter consolidates connections and reduces clutter in tight engine compartments.

Engineered by REDHORSE PERFORMANCE—a trusted manufacturer of aerospace-grade hydraulic fittings for automotive enthusiasts—this 4AN male-to-male adapter features forged aluminum or stainless steel construction rated for sustained high-pressure applications. The integrated 1/8 NPT hex port provides a tapered thread connection suitable for installing fuel pressure gauges, temperature sensors, or proportioning valve bypass lines without interrupting main system flow. The compact 2.835 × 1.095 × 4.423-inch profile and minimal 0.068 lb weight ensure easy routing through congested engine bays while maintaining strict dimensional consistency for OEM-quality reliability under demanding boost, turbo, or supercharger conditions.

This fitting is ideal for fabricators, tuners, and DIY builders upgrading carburetor-to-EFI fuel systems, installing nitrous oxide systems, or adding real-time telemetry sensors to road-course or drag vehicles. It integrates seamlessly with 4AN braided stainless hose assemblies and compatible male AN fittings found on fuel injectors, fuel pumps, oil coolers, and transmission coolers. Proper hose sizing, torque specs per REDHORSE guidelines, and compatible thread-seal tape or sealant ensure leak-free operation across temperature swings and pressure spikes common to forced-induction or naturally aspirated performance platforms.