3/8in NPT Male Pipe Union Black

The 3/8in NPT Male Pipe Union Black by REDHORSE PERFORMANCE is a precision hydraulic and pneumatic fitting engineered for custom fuel systems, coolant lines, and pressurized fluid applications in high-performance automotive builds. Whether you're assembling a custom fuel system on your project car, upgrading engine cooling plumbing, or routing hydraulic lines for brake or suspension modifications, this union connector delivers the reliability and leak-free performance that serious mechanics demand. Designed to join two sections of NPT-threaded pipe or hose with a sealed, removable connection, it's an essential component for any modular fluid distribution system.

This 3/8-inch NPT (National Pipe Thread) male union features a black zinc-plated steel construction that resists corrosion and integrates seamlessly into engine bays, underbody installations, and interior cabin routing. The NPT tapered thread design creates a mechanical seal without additional sealant tape, though most professionals still apply PTFE tape for extra assurance under vibration and thermal cycling. The union's compact profile—measuring 2.85 by 1.5 by 3.6 inches—fits into tight spaces typical of modern engine compartments, and its lightweight construction (0.055 lbs) contributes nothing to vehicle mass while maintaining structural integrity under pressure. REDHORSE PERFORMANCE's manufacturing standard ensures concentric threads and precise tolerances critical for preventing weeping at joints in fuel, coolant, and brake applications.

Professional mechanics and enthusiasts building turbo kits, fuel injection upgrades, custom cooling systems, and high-flow brake plumbing rely on this fitting to create modular, serviceable line assemblies that can be disconnected and reconfigured without cutting or deforming tubing. It pairs with 3/8-inch NPT male or female adapters, hose barbs, and port fittings across fuel rails, heater cores, oil coolers, and transmission coolers. Installation requires only hand-tightening followed by a wrench-assisted quarter turn—over-torquing can strip threads, so finger-tight-plus is the rule. Pressure-rated for common automotive fluid systems (fuel, coolant, oil, hydraulic fluid), this union is the go-to choice for anyone building a clean, professional-grade custom plumbing layout.