4AN Male to 4AN Female 1/8in NPT in Hex Clear

The 4AN Male to 4AN Female 1/8in NPT in Hex Clear adapter by REDHORSE PERFORMANCE is a precision fluid-line coupling designed for builders and mechanics modernizing fuel, coolant, and hydraulic systems in high-performance vehicles. This compact adapter bridges two critical connection styles—AN fittings and NPT ports—allowing seamless integration when upgrading fuel rails, custom cooling loops, or brake pressure lines where legacy and contemporary components must communicate.

Constructed from REDHORSE PERFORMANCE's proven aluminum alloy with a clear anodized finish, this fitting resists corrosion while remaining lightweight—critical for motorsports applications where every tenth of a pound contributes to suspension geometry and acceleration. The 4AN size is typical for fuel and coolant circuits on turbocharged and naturally aspirated performance builds, and the integrated 1/8-inch NPT port accommodates pressure sensors, bleed screws, and gauge ports without additional drilling or welding.

Hex geometry on both ends ensures positive wrench grip and prevents rotational stress on hose barbs or rail bosses during installation and removal cycles. This adapter is essential for custom fuel systems on LS swaps, turbo upgrades, and engine bay renovations, providing reliability under pressure and reducing potential leak points in your plumbing architecture.