45 Male Elbow #4 To 1/8 Npt Steel Fitting

The 45 Male Elbow #4 To 1/8 NPT Steel Fitting is a precision hydraulic connector engineered for high-pressure fuel, oil, and pneumatic systems in performance vehicles and heavy equipment. This elbow-style adapter bridges between SAE #4 (1/4-inch nominal) and 1/8 NPT (National Pipe Thread) ports, making it essential for custom fuel rail setups, turbo plumbing, and auxiliary cooling circuits where space constraints demand compact directional changes. Built by AEROQUIP—a trusted OEM supplier to the automotive and industrial sectors—this fitting delivers the reliability required in demanding engine modifications.

The 45-degree angle geometry reduces flow turbulence and pressure loss compared to 90-degree elbows, a critical advantage when fine-tuning fuel delivery or intercooler lines on turbocharged builds. The steel body resists corrosion and thermal stress, while the NPT female port seals reliably with standard pipe thread sealant tape, ensuring leak-free operation under sustained boost pressure. Its compact footprint (2.35 x 1.1 x 3.7 inches) and minimal weight (0.08 lbs) allow integration into tight engine bays without sacrificing system integrity. The SAE #4 male end accepts standard JIC-style hose with a -4 AN designation, a universal compatibility standard across aftermarket fuel systems and custom plumbing.

Mechanics and fabricators building custom fuel systems, intercooler kits, or auxiliary hydraulic circuits rely on this fitting to navigate complex engine bay layouts while maintaining pressure ratings suitable for EFI systems and forced induction. Whether you're plumbing a carbureted-to-fuel-injection conversion, upgrading a nitrous oxide system, or routing coolant lines around a supercharger installation, the AEROQUIP 45 Male Elbow bridges mismatched port sizes with proven durability. Thread sealant and proper torque specifications—typically 12–18 ft-lbs for the NPT port—ensure a watertight seal in both gasoline and diesel applications.