Endura Adapter Fitting #4 to 1/4 NPT Straight

The Endura Adapter Fitting #4 to 1/4 NPT Straight from RUSSELL is a precision hydraulic and pneumatic line adapter designed for systems requiring reliable port conversion and fluid transfer. This straight-port adapter bridges #4 AN (Army-Navy) male connections to 1/4-inch NPT (National Pipe Thread) male ports, making it essential for fuel systems, brake lines, air suspension setups, and custom fluid delivery applications. Whether you're building a performance engine bay, restoring a classic vehicle, or assembling industrial hydraulic equipment, this adapter ensures leak-free connections between incompatible port standards.

Constructed from lightweight aluminum and finished with nickel anodizing, the Endura adapter combines corrosion resistance with durability in high-vibration environments. The nickel-anodized surface protects against oxidation and salt spray, extending service life in both marine and automotive applications. The straight-flow design minimizes turbulence and pressure drop, critical for maintaining system efficiency in fuel injection, coolant circulation, and air brake systems. RUSSELL's precision engineering ensures proper thread engagement on both the #4 AN male and 1/4 NPT male ends, eliminating the need for additional adapters and reducing connection points that could introduce failure modes.

Technicians, fabricators, and enthusiasts rely on this adapter for retrofit applications, system upgrades, and custom builds where equipment manufacturers used different port standards. Installation is straightforward using standard wrenches or AN-specific tools; thread-sealant tape or pipe dope on the NPT end prevents weeping under pressure. The compact 2.8 x 1.7 x 4.9-inch footprint fits tight engine bays and equipment panels, while the 0.03-pound weight adds negligible mass. Compatible with most automotive, marine, and industrial hydraulic systems, this RUSSELL adapter is a trusted stock item for anyone maintaining or modifying pressurized fluid systems.