3/8in Hose to 3/8in NPT Male Straight Blue

The 3/8in Hose to 3/8in NPT Male Straight Blue fitting from REDHORSE PERFORMANCE is a precision hydraulic adapter engineered for custom fuel, coolant, and brake line systems in high-performance vehicles and engine builds. As a mechanic working on turbocharged, supercharged, and modified engines, you'll recognize this fitting as essential infrastructure for routing pressurized fluids with absolute reliability. Whether you're fabricating a fuel system for a LS swap, upgrading coolant lines on a big-displacement engine, or running custom brake plumbing, the straightforward 3/8-inch hose-to-NPT connection simplifies manifold assembly and eliminates weak points in your system.

REDHORSE fittings are manufactured from aluminum with anodized blue finish—a signature that signals quality aerospace-grade construction and corrosion resistance in engine bays exposed to heat cycling and moisture. The 3/8-inch NPT male thread (National Pipe Thread Tapered) seats into standard female NPT ports on fuel blocks, water pumps, and filter housings, while the hose barb end accepts 3/8-inch ID reinforced hose with a compression fit or hose clamp. The straight configuration keeps your plumbing compact without directional elbows, reducing bend radius strain and simplifying mockup during fabrication. Anodized finish preserves aluminum durability and provides visual identification across your custom harness.

Custom builders, restomod shops, and serious DIY fabricators rely on REDHORSE adapters to bridge production-line ports and aftermarket components without welding or custom machining. Lightweight (0.065 lbs) and compact (2.85 x 1.1 x 3.8 inches), this fitting integrates seamlessly into tight engine compartments on street cars, race builds, and off-road trucks. Use it to connect fuel rails to Aeromotive or Holley regulators, couple coolant bypasses to remote filters, or integrate brake line subsystems—any application where NPT male ports meet hose runs. Stock multiple fittngs to complete modular system designs without interrupting your build schedule.