1/8in NPT Female Pipe Coupler Blue

The 1/8in NPT Female Pipe Coupler Blue from REDHORSE PERFORMANCE is an essential hydraulic and pneumatic connector for custom automotive fuel, oil, coolant, and brake line systems. Whether you're building a high-performance engine bay, upgrading to a remote oil cooler system, or designing a custom fuel delivery setup, this coupler serves as a reliable junction point for 1/8-inch NPT threaded connections. REDHORSE couplers are engineered for builders and mechanics who demand precision, durability, and color-coded organization in their mod work.

This female coupler features NPT (National Pipe Thread) internal threads that accept standard 1/8in NPT male adapters, fittings, and line connections. The blue anodized aluminum construction resists corrosion in engine bays and provides visual identification—a critical advantage when managing multiple fluid circuits in complex systems. The compact profile (approximately 2.84 inches in length) fits tight spaces typical of modern engine compartments, while the coupler's lightweight design (0.083 lbs) minimizes impact on suspension geometry. NPT threads create a secure, leak-resistant seal when properly wrapped with thread sealant tape, a proven standard in both OEM and aftermarket automotive applications.

Street and track mechanics rely on REDHORSE couplers for fuel surge tank plumbing, turbo oil feed and return lines, coolant bypass circuits, and brake fluid distribution in custom chassis builds. The 1/8in NPT Female Pipe Coupler Blue integrates seamlessly with REDHORSE fittings, adapters, and hoses (sold separately) and works with any standard NPT-threaded male component. Installation is straightforward: thread male fittings clockwise until hand-tight, then apply a torque wrench set to 12–15 ft-lbs for NPT connections. This coupler is ideal for LS swaps, fuel system upgrades, cooling system modifications, and any DIY automotive project requiring secure, organized hydraulic connectivity.