#4 Female An To 1/8in Npt

The EARLS #4 Female AN to 1/8 inch NPT adapter fitting is a precision-engineered straight adapter that bridges high-pressure AN (Army-Navy) fluid lines to standard NPT (National Pipe Thread) ports. Built from aluminum and finished in blue anodize, this adapter is designed for systems requiring reliable, leak-free connections in fuel, oil, coolant, and brake applications where size conversion is critical.

The #4 AN female swivel connection accepts standard -4 AN hose and fittings, while the 1/8 inch NPT male port threads directly into NPT-tapped manifolds, blocks, or gauges. The straight configuration minimizes dead legs in the system, reducing potential fluid stagnation and thermal stress. Blue anodizing provides corrosion resistance and helps identify the fitting category in color-coded hydraulic systems. At 0.02 lbs and measuring 3 inches long, this compact adapter integrates cleanly into tight engine bays and component assemblies without adding significant weight or bulk.

This adapter serves custom fuel system builders, automotive restorers, performance engine builders, and industrial fluid systems where AN hose meets NPT ports. Applications include fuel distribution blocks, transmission cooler lines, oil pressure sensing, and intercooler feeds. The EARLS brand is known for precision fitting manufacturing and consistent tolerances, making this adapter a trusted choice for builders who demand repeatability and reliability across multiple installations.

Buyers selecting this adapter should verify port sizing on their application—NPT female receivers require an NPT male adapter, and line sizing must match the -4 AN designation. Proper sealant selection (PTFE thread tape or liquid anaerobic sealant on the NPT threads) ensures leak-free operation under system pressure.